diff --git a/packages/playwright-core/src/server/dispatchers/androidDispatcher.ts b/packages/playwright-core/src/server/dispatchers/androidDispatcher.ts
index 597db65c23..5adb4bbf8e 100644
--- a/packages/playwright-core/src/server/dispatchers/androidDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/androidDispatcher.ts
@@ -22,16 +22,16 @@ import type * as channels from '../../protocol/channels';
 import { BrowserContextDispatcher } from './browserContextDispatcher';
 import type { CallMetadata } from '../instrumentation';
 
-export class AndroidDispatcher extends Dispatcher<Android, channels.AndroidChannel, RootDispatcher, AndroidDispatcher> implements channels.AndroidChannel {
+export class AndroidDispatcher extends Dispatcher<Android, channels.AndroidChannel, RootDispatcher> implements channels.AndroidChannel {
   _type_Android = true;
   constructor(scope: RootDispatcher, android: Android) {
-    super(scope, android, 'Android', {}, true);
+    super(scope, android, 'Android', {});
   }
 
   async devices(params: channels.AndroidDevicesParams): Promise<channels.AndroidDevicesResult> {
     const devices = await this._object.devices(params);
     return {
-      devices: devices.map(d => AndroidDeviceDispatcher.from(this._scope, d))
+      devices: devices.map(d => AndroidDeviceDispatcher.from(this, d))
     };
   }
 
@@ -40,7 +40,7 @@ export class AndroidDispatcher extends Dispatcher<Android, channels.AndroidChann
   }
 }
 
-export class AndroidDeviceDispatcher extends Dispatcher<AndroidDevice, channels.AndroidDeviceChannel, AndroidDispatcher, AndroidDeviceDispatcher> implements channels.AndroidDeviceChannel {
+export class AndroidDeviceDispatcher extends Dispatcher<AndroidDevice, channels.AndroidDeviceChannel, AndroidDispatcher> implements channels.AndroidDeviceChannel {
   _type_EventTarget = true;
   _type_AndroidDevice = true;
 
@@ -53,7 +53,7 @@ export class AndroidDeviceDispatcher extends Dispatcher<AndroidDevice, channels.
     super(scope, device, 'AndroidDevice', {
       model: device.model,
       serial: device.serial,
-    }, true);
+    });
     for (const webView of device.webViews())
       this._dispatchEvent('webViewAdded', { webView });
     this.addObjectListener(AndroidDevice.Events.WebViewAdded, webView => this._dispatchEvent('webViewAdded', { webView }));
@@ -145,7 +145,7 @@ export class AndroidDeviceDispatcher extends Dispatcher<AndroidDevice, channels.
 
   async open(params: channels.AndroidDeviceOpenParams, metadata: CallMetadata): Promise<channels.AndroidDeviceOpenResult> {
     const socket = await this._object.open(params.command);
-    return { socket: new AndroidSocketDispatcher(this._scope, socket) };
+    return { socket: new AndroidSocketDispatcher(this, socket) };
   }
 
   async installApk(params: channels.AndroidDeviceInstallApkParams) {
@@ -158,7 +158,7 @@ export class AndroidDeviceDispatcher extends Dispatcher<AndroidDevice, channels.
 
   async launchBrowser(params: channels.AndroidDeviceLaunchBrowserParams): Promise<channels.AndroidDeviceLaunchBrowserResult> {
     const context = await this._object.launchBrowser(params.pkg, params);
-    return { context: new BrowserContextDispatcher(this._scope, context) };
+    return { context: new BrowserContextDispatcher(this, context) };
   }
 
   async close(params: channels.AndroidDeviceCloseParams) {
@@ -170,15 +170,15 @@ export class AndroidDeviceDispatcher extends Dispatcher<AndroidDevice, channels.
   }
 
   async connectToWebView(params: channels.AndroidDeviceConnectToWebViewParams): Promise<channels.AndroidDeviceConnectToWebViewResult> {
-    return { context: new BrowserContextDispatcher(this._scope, await this._object.connectToWebView(params.socketName)) };
+    return { context: new BrowserContextDispatcher(this, await this._object.connectToWebView(params.socketName)) };
   }
 }
 
-export class AndroidSocketDispatcher extends Dispatcher<SocketBackend, channels.AndroidSocketChannel, AndroidDeviceDispatcher, AndroidSocketDispatcher> implements channels.AndroidSocketChannel {
+export class AndroidSocketDispatcher extends Dispatcher<SocketBackend, channels.AndroidSocketChannel, AndroidDeviceDispatcher> implements channels.AndroidSocketChannel {
   _type_AndroidSocket = true;
 
   constructor(scope: AndroidDeviceDispatcher, socket: SocketBackend) {
-    super(scope, socket, 'AndroidSocket', {}, true);
+    super(scope, socket, 'AndroidSocket', {});
     this.addObjectListener('data', (data: Buffer) => this._dispatchEvent('data', { data }));
     this.addObjectListener('close', () => {
       this._dispatchEvent('close');
diff --git a/packages/playwright-core/src/server/dispatchers/artifactDispatcher.ts b/packages/playwright-core/src/server/dispatchers/artifactDispatcher.ts
index 96a2a11e21..a4bcff1164 100644
--- a/packages/playwright-core/src/server/dispatchers/artifactDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/artifactDispatcher.ts
@@ -62,7 +62,7 @@ export class ArtifactDispatcher extends Dispatcher<Artifact, channels.ArtifactCh
         }
         try {
           const readable = fs.createReadStream(localPath);
-          const stream = new StreamDispatcher(this._scope, readable);
+          const stream = new StreamDispatcher(this, readable);
           // Resolve with a stream, so that client starts saving the data.
           resolve({ stream });
           // Block the Artifact until the stream is consumed.
@@ -83,7 +83,7 @@ export class ArtifactDispatcher extends Dispatcher<Artifact, channels.ArtifactCh
     if (!fileName)
       return {};
     const readable = fs.createReadStream(fileName);
-    return { stream: new StreamDispatcher(this._scope, readable) };
+    return { stream: new StreamDispatcher(this, readable) };
   }
 
   async failure(): Promise<channels.ArtifactFailureResult> {
diff --git a/packages/playwright-core/src/server/dispatchers/browserContextDispatcher.ts b/packages/playwright-core/src/server/dispatchers/browserContextDispatcher.ts
index af6765842b..b8d6d26925 100644
--- a/packages/playwright-core/src/server/dispatchers/browserContextDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/browserContextDispatcher.ts
@@ -34,7 +34,7 @@ import * as path from 'path';
 import { createGuid } from '../../utils';
 import { WritableStreamDispatcher } from './writableStreamDispatcher';
 
-export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channels.BrowserContextChannel, DispatcherScope, BrowserContextDispatcher> implements channels.BrowserContextChannel {
+export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channels.BrowserContextChannel, DispatcherScope> implements channels.BrowserContextChannel {
   _type_EventTarget = true;
   _type_BrowserContext = true;
   private _context: BrowserContext;
@@ -48,7 +48,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
       isChromium: context._browser.options.isChromium,
       requestContext,
       tracing,
-    }, true);
+    });
 
     this.adopt(requestContext);
     this.adopt(tracing);
@@ -70,9 +70,9 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
     }
 
     for (const page of context.pages())
-      this._dispatchEvent('page', { page: PageDispatcher.from(this._scope, page) });
+      this._dispatchEvent('page', { page: PageDispatcher.from(this, page) });
     this.addObjectListener(BrowserContext.Events.Page, page => {
-      this._dispatchEvent('page', { page: PageDispatcher.from(this._scope, page) });
+      this._dispatchEvent('page', { page: PageDispatcher.from(this, page) });
     });
     this.addObjectListener(BrowserContext.Events.Close, () => {
       this._dispatchEvent('close');
@@ -81,33 +81,33 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
 
     if (context._browser.options.name === 'chromium') {
       for (const page of (context as CRBrowserContext).backgroundPages())
-        this._dispatchEvent('backgroundPage', { page: PageDispatcher.from(this._scope, page) });
-      this.addObjectListener(CRBrowserContext.CREvents.BackgroundPage, page => this._dispatchEvent('backgroundPage', { page: PageDispatcher.from(this._scope, page) }));
+        this._dispatchEvent('backgroundPage', { page: PageDispatcher.from(this, page) });
+      this.addObjectListener(CRBrowserContext.CREvents.BackgroundPage, page => this._dispatchEvent('backgroundPage', { page: PageDispatcher.from(this, page) }));
       for (const serviceWorker of (context as CRBrowserContext).serviceWorkers())
-        this._dispatchEvent('serviceWorker', { worker: new WorkerDispatcher(this._scope, serviceWorker) });
-      this.addObjectListener(CRBrowserContext.CREvents.ServiceWorker, serviceWorker => this._dispatchEvent('serviceWorker', { worker: new WorkerDispatcher(this._scope, serviceWorker) }));
+        this._dispatchEvent('serviceWorker', { worker: new WorkerDispatcher(this, serviceWorker) });
+      this.addObjectListener(CRBrowserContext.CREvents.ServiceWorker, serviceWorker => this._dispatchEvent('serviceWorker', { worker: new WorkerDispatcher(this, serviceWorker) }));
     }
     this.addObjectListener(BrowserContext.Events.Request, (request: Request) =>  {
       return this._dispatchEvent('request', {
-        request: RequestDispatcher.from(this._scope, request),
-        page: PageDispatcher.fromNullable(this._scope, request.frame()?._page.initializedOrUndefined())
+        request: RequestDispatcher.from(this, request),
+        page: PageDispatcher.fromNullable(this, request.frame()?._page.initializedOrUndefined())
       });
     });
     this.addObjectListener(BrowserContext.Events.Response, (response: Response) => this._dispatchEvent('response', {
-      response: ResponseDispatcher.from(this._scope, response),
-      page: PageDispatcher.fromNullable(this._scope, response.frame()?._page.initializedOrUndefined())
+      response: ResponseDispatcher.from(this, response),
+      page: PageDispatcher.fromNullable(this, response.frame()?._page.initializedOrUndefined())
     }));
     this.addObjectListener(BrowserContext.Events.RequestFailed, (request: Request) => this._dispatchEvent('requestFailed', {
-      request: RequestDispatcher.from(this._scope, request),
+      request: RequestDispatcher.from(this, request),
       failureText: request._failureText || undefined,
       responseEndTiming: request._responseEndTiming,
-      page: PageDispatcher.fromNullable(this._scope, request.frame()?._page.initializedOrUndefined())
+      page: PageDispatcher.fromNullable(this, request.frame()?._page.initializedOrUndefined())
     }));
     this.addObjectListener(BrowserContext.Events.RequestFinished, ({ request, response }: { request: Request, response: Response | null }) => this._dispatchEvent('requestFinished', {
-      request: RequestDispatcher.from(this._scope, request),
-      response: ResponseDispatcher.fromNullable(this._scope, response),
+      request: RequestDispatcher.from(this, request),
+      response: ResponseDispatcher.fromNullable(this, response),
       responseEndTiming: request._responseEndTiming,
-      page: PageDispatcher.fromNullable(this._scope, request.frame()?._page.initializedOrUndefined()),
+      page: PageDispatcher.fromNullable(this, request.frame()?._page.initializedOrUndefined()),
     }));
   }
 
@@ -117,7 +117,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
     await fs.promises.mkdir(tmpDir);
     this._context._tempDirs.push(tmpDir);
     const file = fs.createWriteStream(path.join(tmpDir, params.name));
-    return { writableStream: new WritableStreamDispatcher(this._scope, file) };
+    return { writableStream: new WritableStreamDispatcher(this, file) };
   }
 
   async setDefaultNavigationTimeoutNoReply(params: channels.BrowserContextSetDefaultNavigationTimeoutNoReplyParams) {
@@ -130,7 +130,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
 
   async exposeBinding(params: channels.BrowserContextExposeBindingParams): Promise<void> {
     await this._context.exposeBinding(params.name, !!params.needsHandle, (source, ...args) => {
-      const pageDispatcher = PageDispatcher.from(this._scope, source.page);
+      const pageDispatcher = PageDispatcher.from(this, source.page);
       const binding = new BindingCallDispatcher(pageDispatcher, params.name, !!params.needsHandle, source, args);
       this._dispatchEvent('bindingCall', { binding });
       return binding.promise();
@@ -187,7 +187,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
       return;
     }
     await this._context.setRequestInterceptor((route, request) => {
-      this._dispatchEvent('route', { route: RouteDispatcher.from(RequestDispatcher.from(this._scope, request), route) });
+      this._dispatchEvent('route', { route: RouteDispatcher.from(RequestDispatcher.from(this, request), route) });
     });
   }
 
@@ -213,7 +213,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
     if (!params.page && !params.frame || params.page && params.frame)
       throw new Error(`CDP session must be initiated with either Page or Frame, not none or both`);
     const crBrowserContext = this._object as CRBrowserContext;
-    return { session: new CDPSessionDispatcher(this._scope, await crBrowserContext.newCDPSession((params.page ? params.page as PageDispatcher : params.frame as FrameDispatcher)._object)) };
+    return { session: new CDPSessionDispatcher(this, await crBrowserContext.newCDPSession((params.page ? params.page as PageDispatcher : params.frame as FrameDispatcher)._object)) };
   }
 
   async harStart(params: channels.BrowserContextHarStartParams): Promise<channels.BrowserContextHarStartResult> {
@@ -225,7 +225,7 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContext, channel
     const artifact = await this._context._harExport(params.harId);
     if (!artifact)
       throw new Error('No HAR artifact. Ensure record.harPath is set.');
-    return { artifact: new ArtifactDispatcher(this._scope, artifact) };
+    return { artifact: new ArtifactDispatcher(this, artifact) };
   }
 
   override _dispose() {
diff --git a/packages/playwright-core/src/server/dispatchers/browserDispatcher.ts b/packages/playwright-core/src/server/dispatchers/browserDispatcher.ts
index e9556c437c..b1e5c84fff 100644
--- a/packages/playwright-core/src/server/dispatchers/browserDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/browserDispatcher.ts
@@ -29,11 +29,11 @@ import { BrowserContext } from '../browserContext';
 import { Selectors } from '../selectors';
 import type { BrowserTypeDispatcher } from './browserTypeDispatcher';
 
-export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserChannel, BrowserTypeDispatcher, BrowserDispatcher> implements channels.BrowserChannel {
+export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserChannel, BrowserTypeDispatcher> implements channels.BrowserChannel {
   _type_Browser = true;
 
   constructor(scope: BrowserTypeDispatcher, browser: Browser) {
-    super(scope, browser, 'Browser', { version: browser.version(), name: browser.options.name }, true);
+    super(scope, browser, 'Browser', { version: browser.version(), name: browser.options.name });
     this.addObjectListener(Browser.Events.Disconnected, () => this._didClose());
   }
 
@@ -44,11 +44,11 @@ export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserChann
 
   async newContext(params: channels.BrowserNewContextParams, metadata: CallMetadata): Promise<channels.BrowserNewContextResult> {
     const context = await this._object.newContext(metadata, params);
-    return { context: new BrowserContextDispatcher(this._scope, context) };
+    return { context: new BrowserContextDispatcher(this, context) };
   }
 
   async newContextForReuse(params: channels.BrowserNewContextForReuseParams, metadata: CallMetadata): Promise<channels.BrowserNewContextForReuseResult> {
-    return newContextForReuse(this._object, this._scope, params, null, metadata);
+    return newContextForReuse(this._object, this, params, null, metadata);
   }
 
   async close(): Promise<void> {
@@ -63,7 +63,7 @@ export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserChann
     if (!this._object.options.isChromium)
       throw new Error(`CDP session is only available in Chromium`);
     const crBrowser = this._object as CRBrowser;
-    return { session: new CDPSessionDispatcher(this._scope, await crBrowser.newBrowserCDPSession()) };
+    return { session: new CDPSessionDispatcher(this, await crBrowser.newBrowserCDPSession()) };
   }
 
   async startTracing(params: channels.BrowserStartTracingParams): Promise<void> {
@@ -82,13 +82,13 @@ export class BrowserDispatcher extends Dispatcher<Browser, channels.BrowserChann
 }
 
 // This class implements multiplexing browser dispatchers over a single Browser instance.
-export class ConnectedBrowserDispatcher extends Dispatcher<Browser, channels.BrowserChannel, RootDispatcher, BrowserDispatcher> implements channels.BrowserChannel {
+export class ConnectedBrowserDispatcher extends Dispatcher<Browser, channels.BrowserChannel, RootDispatcher> implements channels.BrowserChannel {
   _type_Browser = true;
   private _contexts = new Set<BrowserContext>();
   readonly selectors: Selectors;
 
   constructor(scope: RootDispatcher, browser: Browser) {
-    super(scope, browser, 'Browser', { version: browser.version(), name: browser.options.name }, true);
+    super(scope, browser, 'Browser', { version: browser.version(), name: browser.options.name });
     // When we have a remotely-connected browser, each client gets a fresh Selector instance,
     // so that two clients do not interfere between each other.
     this.selectors = new Selectors();
@@ -101,11 +101,11 @@ export class ConnectedBrowserDispatcher extends Dispatcher<Browser, channels.Bro
     this._contexts.add(context);
     context.setSelectors(this.selectors);
     context.on(BrowserContext.Events.Close, () => this._contexts.delete(context));
-    return { context: new BrowserContextDispatcher(this._scope, context) };
+    return { context: new BrowserContextDispatcher(this, context) };
   }
 
   async newContextForReuse(params: channels.BrowserNewContextForReuseParams, metadata: CallMetadata): Promise<channels.BrowserNewContextForReuseResult> {
-    return newContextForReuse(this._object, this._scope, params, this.selectors, metadata);
+    return newContextForReuse(this._object, this as any as BrowserDispatcher, params, this.selectors, metadata);
   }
 
   async close(): Promise<void> {
@@ -120,7 +120,7 @@ export class ConnectedBrowserDispatcher extends Dispatcher<Browser, channels.Bro
     if (!this._object.options.isChromium)
       throw new Error(`CDP session is only available in Chromium`);
     const crBrowser = this._object as CRBrowser;
-    return { session: new CDPSessionDispatcher(this._scope, await crBrowser.newBrowserCDPSession()) };
+    return { session: new CDPSessionDispatcher(this as any as BrowserDispatcher, await crBrowser.newBrowserCDPSession()) };
   }
 
   async startTracing(params: channels.BrowserStartTracingParams): Promise<void> {
diff --git a/packages/playwright-core/src/server/dispatchers/browserTypeDispatcher.ts b/packages/playwright-core/src/server/dispatchers/browserTypeDispatcher.ts
index 07d5090f79..f2cf3e51b9 100644
--- a/packages/playwright-core/src/server/dispatchers/browserTypeDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/browserTypeDispatcher.ts
@@ -29,28 +29,28 @@ import { ProgressController } from '../progress';
 import { WebSocketTransport } from '../transport';
 import { findValidator, ValidationError, type ValidatorContext } from '../../protocol/validator';
 
-export class BrowserTypeDispatcher extends Dispatcher<BrowserType, channels.BrowserTypeChannel, RootDispatcher, BrowserTypeDispatcher> implements channels.BrowserTypeChannel {
+export class BrowserTypeDispatcher extends Dispatcher<BrowserType, channels.BrowserTypeChannel, RootDispatcher> implements channels.BrowserTypeChannel {
   _type_BrowserType = true;
   constructor(scope: RootDispatcher, browserType: BrowserType) {
     super(scope, browserType, 'BrowserType', {
       executablePath: browserType.executablePath(),
       name: browserType.name()
-    }, true);
+    });
   }
 
   async launch(params: channels.BrowserTypeLaunchParams, metadata: CallMetadata): Promise<channels.BrowserTypeLaunchResult> {
     const browser = await this._object.launch(metadata, params);
-    return { browser: new BrowserDispatcher(this._scope, browser) };
+    return { browser: new BrowserDispatcher(this, browser) };
   }
 
   async launchPersistentContext(params: channels.BrowserTypeLaunchPersistentContextParams, metadata: CallMetadata): Promise<channels.BrowserTypeLaunchPersistentContextResult> {
     const browserContext = await this._object.launchPersistentContext(metadata, params.userDataDir, params);
-    return { context: new BrowserContextDispatcher(this._scope, browserContext) };
+    return { context: new BrowserContextDispatcher(this, browserContext) };
   }
 
   async connectOverCDP(params: channels.BrowserTypeConnectOverCDPParams, metadata: CallMetadata): Promise<channels.BrowserTypeConnectOverCDPResult> {
     const browser = await this._object.connectOverCDP(metadata, params.endpointURL, params, params.timeout);
-    const browserDispatcher = new BrowserDispatcher(this._scope, browser);
+    const browserDispatcher = new BrowserDispatcher(this, browser);
     return {
       browser: browserDispatcher,
       defaultContext: browser._defaultContext ? new BrowserContextDispatcher(browserDispatcher, browser._defaultContext) : undefined,
@@ -64,7 +64,7 @@ export class BrowserTypeDispatcher extends Dispatcher<BrowserType, channels.Brow
       const paramsHeaders = Object.assign({ 'User-Agent': getUserAgent() }, params.headers || {});
       const transport = await WebSocketTransport.connect(progress, params.wsEndpoint, paramsHeaders, true);
       let socksInterceptor: SocksInterceptor | undefined;
-      const pipe = new JsonPipeDispatcher(this._scope);
+      const pipe = new JsonPipeDispatcher(this);
       transport.onmessage = json => {
         if (json.method === '__create__' && json.params.type === 'SocksSupport')
           socksInterceptor = new SocksInterceptor(transport, params.socksProxyRedirectPortForTest, json.params.guid);
diff --git a/packages/playwright-core/src/server/dispatchers/cdpSessionDispatcher.ts b/packages/playwright-core/src/server/dispatchers/cdpSessionDispatcher.ts
index 9a1ff337c2..4dd724f992 100644
--- a/packages/playwright-core/src/server/dispatchers/cdpSessionDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/cdpSessionDispatcher.ts
@@ -21,11 +21,11 @@ import { Dispatcher } from './dispatcher';
 import type { BrowserDispatcher } from './browserDispatcher';
 import type { BrowserContextDispatcher } from './browserContextDispatcher';
 
-export class CDPSessionDispatcher extends Dispatcher<CRSession, channels.CDPSessionChannel, BrowserDispatcher | BrowserContextDispatcher, CDPSessionDispatcher> implements channels.CDPSessionChannel {
+export class CDPSessionDispatcher extends Dispatcher<CRSession, channels.CDPSessionChannel, BrowserDispatcher | BrowserContextDispatcher> implements channels.CDPSessionChannel {
   _type_CDPSession = true;
 
   constructor(scope: BrowserDispatcher | BrowserContextDispatcher, crSession: CRSession) {
-    super(scope, crSession, 'CDPSession', {}, true);
+    super(scope, crSession, 'CDPSession', {});
     crSession._eventListener = (method, params) => {
       this._dispatchEvent('event', { method, params });
     };
diff --git a/packages/playwright-core/src/server/dispatchers/dispatcher.ts b/packages/playwright-core/src/server/dispatchers/dispatcher.ts
index 5abc2003ce..dda9007423 100644
--- a/packages/playwright-core/src/server/dispatchers/dispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/dispatcher.ts
@@ -44,9 +44,8 @@ export function lookupNullableDispatcher<DispatcherType>(object: any | null): Di
   return object ? lookupDispatcher(object) : undefined;
 }
 
-export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeType extends DispatcherScope, ScopeType extends DispatcherScope = ParentScopeType> extends EventEmitter implements channels.Channel {
+export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeType extends DispatcherScope> extends EventEmitter implements channels.Channel {
   private _connection: DispatcherConnection;
-  private _isScope: boolean;
   // Parent is always "isScope".
   private _parent: ParentScopeType | undefined;
   // Only "isScope" channel owners have registered dispatchers inside.
@@ -56,16 +55,13 @@ export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeT
 
   readonly _guid: string;
   readonly _type: string;
-  readonly _scope: ScopeType;
   _object: Type;
 
-  constructor(parent: ParentScopeType | DispatcherConnection, object: Type, type: string, initializer: channels.InitializerTraits<Type>, isScope?: boolean) {
+  constructor(parent: ParentScopeType | DispatcherConnection, object: Type, type: string, initializer: channels.InitializerTraits<Type>) {
     super();
 
     this._connection = parent instanceof DispatcherConnection ? parent : parent._connection;
-    this._isScope = !!isScope;
     this._parent = parent instanceof DispatcherConnection ? undefined : parent;
-    this._scope = (isScope ? this : this._parent!) as any as ScopeType;
 
     const guid = object.guid;
     assert(!this._connection._dispatchers.has(guid));
@@ -84,8 +80,8 @@ export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeT
       this._connection.sendCreate(this._parent, type, guid, initializer, this._parent._object);
   }
 
-  parentScope(): ParentScopeType | undefined {
-    return this._parent;
+  parentScope(): ParentScopeType {
+    return this._parent!;
   }
 
   addObjectListener(eventName: (string | symbol), handler: (...args: any[]) => void) {
@@ -93,7 +89,6 @@ export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeT
   }
 
   adopt(child: DispatcherScope) {
-    assert(this._isScope);
     const oldParent = child._parent!;
     oldParent._dispatchers.delete(child._guid);
     this._dispatchers.set(child._guid, child);
@@ -113,6 +108,11 @@ export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeT
   }
 
   _dispose() {
+    this._disposeRecursively();
+    this._connection.sendDispose(this);
+  }
+
+  private _disposeRecursively() {
     assert(!this._disposed, `${this._guid} is disposed more than once`);
     this._disposed = true;
     eventsHelper.removeEventListeners(this._eventListeners);
@@ -124,11 +124,8 @@ export class Dispatcher<Type extends { guid: string }, ChannelType, ParentScopeT
 
     // Dispose all children.
     for (const dispatcher of [...this._dispatchers.values()])
-      dispatcher._dispose();
+      dispatcher._disposeRecursively();
     this._dispatchers.clear();
-
-    if (this._isScope)
-      this._connection.sendDispose(this);
     delete (this._object as any)[dispatcherSymbol];
   }
 
@@ -150,7 +147,7 @@ export class RootDispatcher extends Dispatcher<{ guid: '' }, any, any> {
   private _initialized = false;
 
   constructor(connection: DispatcherConnection, private readonly createPlaywright?: (scope: RootDispatcher, options: channels.RootInitializeParams) => Promise<PlaywrightDispatcher>) {
-    super(connection, { guid: '' }, 'Root', {}, true);
+    super(connection, { guid: '' }, 'Root', {});
   }
 
   async initialize(params: channels.RootInitializeParams): Promise<channels.RootInitializeResult> {
diff --git a/packages/playwright-core/src/server/dispatchers/electronDispatcher.ts b/packages/playwright-core/src/server/dispatchers/electronDispatcher.ts
index 514a47c3ed..0462bad356 100644
--- a/packages/playwright-core/src/server/dispatchers/electronDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/electronDispatcher.ts
@@ -24,27 +24,27 @@ import type { PageDispatcher } from './pageDispatcher';
 import { parseArgument, serializeResult } from './jsHandleDispatcher';
 import { ElementHandleDispatcher } from './elementHandlerDispatcher';
 
-export class ElectronDispatcher extends Dispatcher<Electron, channels.ElectronChannel, RootDispatcher, ElectronDispatcher> implements channels.ElectronChannel {
+export class ElectronDispatcher extends Dispatcher<Electron, channels.ElectronChannel, RootDispatcher> implements channels.ElectronChannel {
   _type_Electron = true;
 
   constructor(scope: RootDispatcher, electron: Electron) {
-    super(scope, electron, 'Electron', {}, true);
+    super(scope, electron, 'Electron', {});
   }
 
   async launch(params: channels.ElectronLaunchParams): Promise<channels.ElectronLaunchResult> {
     const electronApplication = await this._object.launch(params);
-    return { electronApplication: new ElectronApplicationDispatcher(this._scope, electronApplication) };
+    return { electronApplication: new ElectronApplicationDispatcher(this, electronApplication) };
   }
 }
 
-export class ElectronApplicationDispatcher extends Dispatcher<ElectronApplication, channels.ElectronApplicationChannel, ElectronDispatcher, ElectronApplicationDispatcher> implements channels.ElectronApplicationChannel {
+export class ElectronApplicationDispatcher extends Dispatcher<ElectronApplication, channels.ElectronApplicationChannel, ElectronDispatcher> implements channels.ElectronApplicationChannel {
   _type_EventTarget = true;
   _type_ElectronApplication = true;
 
   constructor(scope: ElectronDispatcher, electronApplication: ElectronApplication) {
     super(scope, electronApplication, 'ElectronApplication', {
       context: new BrowserContextDispatcher(scope, electronApplication.context())
-    }, true);
+    });
     this.addObjectListener(ElectronApplication.Events.Close, () => {
       this._dispatchEvent('close');
       this._dispose();
@@ -53,7 +53,7 @@ export class ElectronApplicationDispatcher extends Dispatcher<ElectronApplicatio
 
   async browserWindow(params: channels.ElectronApplicationBrowserWindowParams): Promise<channels.ElectronApplicationBrowserWindowResult> {
     const handle = await this._object.browserWindow((params.page as PageDispatcher).page());
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, handle) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this, handle) };
   }
 
   async evaluateExpression(params: channels.ElectronApplicationEvaluateExpressionParams): Promise<channels.ElectronApplicationEvaluateExpressionResult> {
@@ -64,7 +64,7 @@ export class ElectronApplicationDispatcher extends Dispatcher<ElectronApplicatio
   async evaluateExpressionHandle(params: channels.ElectronApplicationEvaluateExpressionHandleParams): Promise<channels.ElectronApplicationEvaluateExpressionHandleResult> {
     const handle = await this._object._nodeElectronHandlePromise;
     const result = await handle.evaluateExpressionAndWaitForSignals(params.expression, params.isFunction, false /* returnByValue */, parseArgument(params.arg));
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, result) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this, result) };
   }
 
   async close(): Promise<void> {
diff --git a/packages/playwright-core/src/server/dispatchers/elementHandlerDispatcher.ts b/packages/playwright-core/src/server/dispatchers/elementHandlerDispatcher.ts
index b0288ddebe..786c03c97c 100644
--- a/packages/playwright-core/src/server/dispatchers/elementHandlerDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/elementHandlerDispatcher.ts
@@ -197,12 +197,12 @@ export class ElementHandleDispatcher extends JSHandleDispatcher implements chann
 
   async querySelector(params: channels.ElementHandleQuerySelectorParams, metadata: CallMetadata): Promise<channels.ElementHandleQuerySelectorResult> {
     const handle = await this._elementHandle.querySelector(params.selector, params);
-    return { element: ElementHandleDispatcher.fromNullable(this._scope, handle) };
+    return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), handle) };
   }
 
   async querySelectorAll(params: channels.ElementHandleQuerySelectorAllParams, metadata: CallMetadata): Promise<channels.ElementHandleQuerySelectorAllResult> {
     const elements = await this._elementHandle.querySelectorAll(params.selector);
-    return { elements: elements.map(e => ElementHandleDispatcher.from(this._scope, e)) };
+    return { elements: elements.map(e => ElementHandleDispatcher.from(this.parentScope(), e)) };
   }
 
   async evalOnSelector(params: channels.ElementHandleEvalOnSelectorParams, metadata: CallMetadata): Promise<channels.ElementHandleEvalOnSelectorResult> {
@@ -218,6 +218,6 @@ export class ElementHandleDispatcher extends JSHandleDispatcher implements chann
   }
 
   async waitForSelector(params: channels.ElementHandleWaitForSelectorParams, metadata: CallMetadata): Promise<channels.ElementHandleWaitForSelectorResult> {
-    return { element: ElementHandleDispatcher.fromNullable(this._scope, await this._elementHandle.waitForSelector(metadata, params.selector, params)) };
+    return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), await this._elementHandle.waitForSelector(metadata, params.selector, params)) };
   }
 }
diff --git a/packages/playwright-core/src/server/dispatchers/frameDispatcher.ts b/packages/playwright-core/src/server/dispatchers/frameDispatcher.ts
index da3551adee..4f69b42d38 100644
--- a/packages/playwright-core/src/server/dispatchers/frameDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/frameDispatcher.ts
@@ -49,7 +49,7 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
       name: frame.name(),
       parentFrame: FrameDispatcher.fromNullable(scope, frame.parentFrame()),
       loadStates: Array.from(frame._subtreeLifecycleEvents),
-    }, true);
+    });
     this._frame = frame;
     this.addObjectListener(Frame.Events.AddLifecycle, lifecycleEvent => {
       this._dispatchEvent('loadstate', { add: lifecycleEvent });
@@ -62,7 +62,7 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
         return;
       const params = { url: event.url, name: event.name, error: event.error ? event.error.message : undefined };
       if (event.newDocument)
-        (params as any).newDocument = { request: RequestDispatcher.fromNullable(scope.parentScope()!, event.newDocument.request || null) };
+        (params as any).newDocument = { request: RequestDispatcher.fromNullable(scope.parentScope(), event.newDocument.request || null) };
       this._dispatchEvent('navigated', params);
     });
   }
@@ -72,7 +72,7 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async frameElement(): Promise<channels.FrameFrameElementResult> {
-    return { element: ElementHandleDispatcher.from(this._scope, await this._frame.frameElement()) };
+    return { element: ElementHandleDispatcher.from(this.parentScope(), await this._frame.frameElement()) };
   }
 
   async evaluateExpression(params: channels.FrameEvaluateExpressionParams, metadata: CallMetadata): Promise<channels.FrameEvaluateExpressionResult> {
@@ -80,11 +80,11 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async evaluateExpressionHandle(params: channels.FrameEvaluateExpressionHandleParams, metadata: CallMetadata): Promise<channels.FrameEvaluateExpressionHandleResult> {
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, await this._frame.evaluateExpressionHandleAndWaitForSignals(params.expression, params.isFunction, parseArgument(params.arg), 'main')) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this.parentScope(), await this._frame.evaluateExpressionHandleAndWaitForSignals(params.expression, params.isFunction, parseArgument(params.arg), 'main')) };
   }
 
   async waitForSelector(params: channels.FrameWaitForSelectorParams, metadata: CallMetadata): Promise<channels.FrameWaitForSelectorResult> {
-    return { element: ElementHandleDispatcher.fromNullable(this._scope, await this._frame.waitForSelector(metadata, params.selector, params)) };
+    return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), await this._frame.waitForSelector(metadata, params.selector, params)) };
   }
 
   async dispatchEvent(params: channels.FrameDispatchEventParams, metadata: CallMetadata): Promise<void> {
@@ -100,12 +100,12 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async querySelector(params: channels.FrameQuerySelectorParams, metadata: CallMetadata): Promise<channels.FrameQuerySelectorResult> {
-    return { element: ElementHandleDispatcher.fromNullable(this._scope, await this._frame.querySelector(params.selector, params)) };
+    return { element: ElementHandleDispatcher.fromNullable(this.parentScope(), await this._frame.querySelector(params.selector, params)) };
   }
 
   async querySelectorAll(params: channels.FrameQuerySelectorAllParams, metadata: CallMetadata): Promise<channels.FrameQuerySelectorAllResult> {
     const elements = await this._frame.querySelectorAll(params.selector);
-    return { elements: elements.map(e => ElementHandleDispatcher.from(this._scope, e)) };
+    return { elements: elements.map(e => ElementHandleDispatcher.from(this.parentScope(), e)) };
   }
 
   async queryCount(params: channels.FrameQueryCountParams): Promise<channels.FrameQueryCountResult> {
@@ -121,11 +121,11 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async addScriptTag(params: channels.FrameAddScriptTagParams, metadata: CallMetadata): Promise<channels.FrameAddScriptTagResult> {
-    return { element: ElementHandleDispatcher.from(this._scope, await this._frame.addScriptTag(params)) };
+    return { element: ElementHandleDispatcher.from(this.parentScope(), await this._frame.addScriptTag(params)) };
   }
 
   async addStyleTag(params: channels.FrameAddStyleTagParams, metadata: CallMetadata): Promise<channels.FrameAddStyleTagResult> {
-    return { element: ElementHandleDispatcher.from(this._scope, await this._frame.addStyleTag(params)) };
+    return { element: ElementHandleDispatcher.from(this.parentScope(), await this._frame.addStyleTag(params)) };
   }
 
   async click(params: channels.FrameClickParams, metadata: CallMetadata): Promise<void> {
@@ -245,7 +245,7 @@ export class FrameDispatcher extends Dispatcher<Frame, channels.FrameChannel, Pa
   }
 
   async waitForFunction(params: channels.FrameWaitForFunctionParams, metadata: CallMetadata): Promise<channels.FrameWaitForFunctionResult> {
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, await this._frame._waitForFunctionExpression(metadata, params.expression, params.isFunction, parseArgument(params.arg), params)) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this.parentScope(), await this._frame._waitForFunctionExpression(metadata, params.expression, params.isFunction, parseArgument(params.arg), params)) };
   }
 
   async title(params: channels.FrameTitleParams, metadata: CallMetadata): Promise<channels.FrameTitleResult> {
diff --git a/packages/playwright-core/src/server/dispatchers/jsHandleDispatcher.ts b/packages/playwright-core/src/server/dispatchers/jsHandleDispatcher.ts
index 9d55a8e4d2..78dbc40489 100644
--- a/packages/playwright-core/src/server/dispatchers/jsHandleDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/jsHandleDispatcher.ts
@@ -41,19 +41,19 @@ export class JSHandleDispatcher extends Dispatcher<js.JSHandle, channels.JSHandl
 
   async evaluateExpressionHandle(params: channels.JSHandleEvaluateExpressionHandleParams): Promise<channels.JSHandleEvaluateExpressionHandleResult> {
     const jsHandle = await this._object.evaluateExpressionAndWaitForSignals(params.expression, params.isFunction, false /* returnByValue */, parseArgument(params.arg));
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, jsHandle) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this.parentScope(), jsHandle) };
   }
 
   async getProperty(params: channels.JSHandleGetPropertyParams): Promise<channels.JSHandleGetPropertyResult> {
     const jsHandle = await this._object.getProperty(params.name);
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, jsHandle) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this.parentScope(), jsHandle) };
   }
 
   async getPropertyList(): Promise<channels.JSHandleGetPropertyListResult> {
     const map = await this._object.getProperties();
     const properties = [];
     for (const [name, value] of map)
-      properties.push({ name, value: ElementHandleDispatcher.fromJSHandle(this._scope, value) });
+      properties.push({ name, value: ElementHandleDispatcher.fromJSHandle(this.parentScope(), value) });
     return { properties };
   }
 
diff --git a/packages/playwright-core/src/server/dispatchers/networkDispatchers.ts b/packages/playwright-core/src/server/dispatchers/networkDispatchers.ts
index 74d93f696c..b5e33ab4e9 100644
--- a/packages/playwright-core/src/server/dispatchers/networkDispatchers.ts
+++ b/packages/playwright-core/src/server/dispatchers/networkDispatchers.ts
@@ -164,7 +164,7 @@ export class WebSocketDispatcher extends Dispatcher<WebSocket, channels.WebSocke
   }
 }
 
-export class APIRequestContextDispatcher extends Dispatcher<APIRequestContext, channels.APIRequestContextChannel, RootDispatcher | BrowserContextDispatcher, APIRequestContextDispatcher> implements channels.APIRequestContextChannel {
+export class APIRequestContextDispatcher extends Dispatcher<APIRequestContext, channels.APIRequestContextChannel, RootDispatcher | BrowserContextDispatcher> implements channels.APIRequestContextChannel {
   _type_APIRequestContext = true;
 
   static from(scope: RootDispatcher | BrowserContextDispatcher, request: APIRequestContext): APIRequestContextDispatcher {
@@ -182,7 +182,7 @@ export class APIRequestContextDispatcher extends Dispatcher<APIRequestContext, c
 
     super(parentScope, request, 'APIRequestContext', {
       tracing,
-    }, true);
+    });
 
     this.adopt(tracing);
   }
diff --git a/packages/playwright-core/src/server/dispatchers/pageDispatcher.ts b/packages/playwright-core/src/server/dispatchers/pageDispatcher.ts
index 006d62c4a0..46def1a87f 100644
--- a/packages/playwright-core/src/server/dispatchers/pageDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/pageDispatcher.ts
@@ -38,7 +38,7 @@ import type { Download } from '../download';
 import { createGuid } from '../../utils';
 import type { BrowserContextDispatcher } from './browserContextDispatcher';
 
-export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, BrowserContextDispatcher, PageDispatcher> implements channels.PageChannel {
+export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, BrowserContextDispatcher> implements channels.PageChannel {
   _type_EventTarget = true;
   _type_Page = true;
   private _page: Page;
@@ -66,7 +66,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
       viewportSize: page.viewportSize() || undefined,
       isClosed: page.isClosed(),
       opener: PageDispatcher.fromNullable(parentScope, page.opener())
-    }, true);
+    });
 
     this.adopt(mainFrame);
 
@@ -75,22 +75,22 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
       this._dispatchEvent('close');
       this._dispose();
     });
-    this.addObjectListener(Page.Events.Console, message => this._dispatchEvent('console', { message: new ConsoleMessageDispatcher(this._scope, message) }));
+    this.addObjectListener(Page.Events.Console, message => this._dispatchEvent('console', { message: new ConsoleMessageDispatcher(this, message) }));
     this.addObjectListener(Page.Events.Crash, () => this._dispatchEvent('crash'));
-    this.addObjectListener(Page.Events.Dialog, dialog => this._dispatchEvent('dialog', { dialog: new DialogDispatcher(this._scope, dialog) }));
+    this.addObjectListener(Page.Events.Dialog, dialog => this._dispatchEvent('dialog', { dialog: new DialogDispatcher(this, dialog) }));
     this.addObjectListener(Page.Events.Download, (download: Download) => {
       // Artifact can outlive the page, so bind to the context scope.
       this._dispatchEvent('download', { url: download.url, suggestedFilename: download.suggestedFilename(), artifact: new ArtifactDispatcher(parentScope, download.artifact) });
     });
     this.addObjectListener(Page.Events.FileChooser, (fileChooser: FileChooser) => this._dispatchEvent('fileChooser', {
-      element: ElementHandleDispatcher.from(this._scope, fileChooser.element()),
+      element: ElementHandleDispatcher.from(this, fileChooser.element()),
       isMultiple: fileChooser.isMultiple()
     }));
     this.addObjectListener(Page.Events.FrameAttached, frame => this._onFrameAttached(frame));
     this.addObjectListener(Page.Events.FrameDetached, frame => this._onFrameDetached(frame));
     this.addObjectListener(Page.Events.PageError, error => this._dispatchEvent('pageError', { error: serializeError(error) }));
-    this.addObjectListener(Page.Events.WebSocket, webSocket => this._dispatchEvent('webSocket', { webSocket: new WebSocketDispatcher(this._scope, webSocket) }));
-    this.addObjectListener(Page.Events.Worker, worker => this._dispatchEvent('worker', { worker: new WorkerDispatcher(this._scope, worker) }));
+    this.addObjectListener(Page.Events.WebSocket, webSocket => this._dispatchEvent('webSocket', { webSocket: new WebSocketDispatcher(this, webSocket) }));
+    this.addObjectListener(Page.Events.Worker, worker => this._dispatchEvent('worker', { worker: new WorkerDispatcher(this, worker) }));
     this.addObjectListener(Page.Events.Video, (artifact: Artifact) => this._dispatchEvent('video', { artifact: existingDispatcher<ArtifactDispatcher>(artifact) }));
     if (page._video)
       this._dispatchEvent('video', { artifact: existingDispatcher<ArtifactDispatcher>(page._video) });
@@ -114,7 +114,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
 
   async exposeBinding(params: channels.PageExposeBindingParams, metadata: CallMetadata): Promise<void> {
     await this._page.exposeBinding(params.name, !!params.needsHandle, (source, ...args) => {
-      const binding = new BindingCallDispatcher(this._scope, params.name, !!params.needsHandle, source, args);
+      const binding = new BindingCallDispatcher(this, params.name, !!params.needsHandle, source, args);
       this._dispatchEvent('bindingCall', { binding });
       return binding.promise();
     });
@@ -159,7 +159,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
       return;
     }
     await this._page.setClientRequestInterceptor((route, request) => {
-      this._dispatchEvent('route', { route: RouteDispatcher.from(RequestDispatcher.from(this.parentScope()!, request), route) });
+      this._dispatchEvent('route', { route: RouteDispatcher.from(RequestDispatcher.from(this.parentScope(), request), route) });
     });
   }
 
@@ -282,7 +282,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
   }
 
   _onFrameAttached(frame: Frame) {
-    this._dispatchEvent('frameAttached', { frame: FrameDispatcher.from(this._scope, frame) });
+    this._dispatchEvent('frameAttached', { frame: FrameDispatcher.from(this, frame) });
   }
 
   _onFrameDetached(frame: Frame) {
@@ -296,7 +296,7 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageChannel, Brows
 }
 
 
-export class WorkerDispatcher extends Dispatcher<Worker, channels.WorkerChannel, PageDispatcher | BrowserContextDispatcher, WorkerDispatcher> implements channels.WorkerChannel {
+export class WorkerDispatcher extends Dispatcher<Worker, channels.WorkerChannel, PageDispatcher | BrowserContextDispatcher> implements channels.WorkerChannel {
   _type_Worker = true;
 
   static fromNullable(scope: PageDispatcher | BrowserContextDispatcher, worker: Worker | null): WorkerDispatcher | undefined {
@@ -309,7 +309,7 @@ export class WorkerDispatcher extends Dispatcher<Worker, channels.WorkerChannel,
   constructor(scope: PageDispatcher | BrowserContextDispatcher, worker: Worker) {
     super(scope, worker, 'Worker', {
       url: worker.url()
-    }, true);
+    });
     this.addObjectListener(Worker.Events.Close, () => this._dispatchEvent('close'));
   }
 
@@ -318,7 +318,7 @@ export class WorkerDispatcher extends Dispatcher<Worker, channels.WorkerChannel,
   }
 
   async evaluateExpressionHandle(params: channels.WorkerEvaluateExpressionHandleParams, metadata: CallMetadata): Promise<channels.WorkerEvaluateExpressionHandleResult> {
-    return { handle: ElementHandleDispatcher.fromJSHandle(this._scope, await this._object.evaluateExpressionHandle(params.expression, params.isFunction, parseArgument(params.arg))) };
+    return { handle: ElementHandleDispatcher.fromJSHandle(this, await this._object.evaluateExpressionHandle(params.expression, params.isFunction, parseArgument(params.arg))) };
   }
 }
 
diff --git a/packages/playwright-core/src/server/dispatchers/playwrightDispatcher.ts b/packages/playwright-core/src/server/dispatchers/playwrightDispatcher.ts
index 9bdb4f1d87..2e925589b6 100644
--- a/packages/playwright-core/src/server/dispatchers/playwrightDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/playwrightDispatcher.ts
@@ -52,14 +52,14 @@ export class PlaywrightDispatcher extends Dispatcher<Playwright, channels.Playwr
       selectors: new SelectorsDispatcher(scope, browserDispatcher?.selectors || playwright.selectors),
       preLaunchedBrowser: browserDispatcher,
       socksSupport: socksProxy ? new SocksSupportDispatcher(scope, socksProxy) : undefined,
-    }, false);
+    });
     this._type_Playwright = true;
     this._browserDispatcher = browserDispatcher;
   }
 
   async newRequest(params: channels.PlaywrightNewRequestParams, metadata?: channels.Metadata): Promise<channels.PlaywrightNewRequestResult> {
     const request = new GlobalAPIRequestContext(this._object, params);
-    return { request: APIRequestContextDispatcher.from(this._scope, request) };
+    return { request: APIRequestContextDispatcher.from(this.parentScope(), request) };
   }
 
   async hideHighlight(params: channels.PlaywrightHideHighlightParams, metadata?: channels.Metadata): Promise<channels.PlaywrightHideHighlightResult> {
diff --git a/packages/playwright-core/src/server/dispatchers/streamDispatcher.ts b/packages/playwright-core/src/server/dispatchers/streamDispatcher.ts
index 0e1fb617ee..9e2740540a 100644
--- a/packages/playwright-core/src/server/dispatchers/streamDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/streamDispatcher.ts
@@ -15,16 +15,16 @@
  */
 
 import type * as channels from '../../protocol/channels';
-import type { DispatcherScope } from './dispatcher';
 import { Dispatcher } from './dispatcher';
 import type * as stream from 'stream';
 import { createGuid } from '../../utils';
+import type { ArtifactDispatcher } from './artifactDispatcher';
 
-export class StreamDispatcher extends Dispatcher<{ guid: string, stream: stream.Readable }, channels.StreamChannel, DispatcherScope> implements channels.StreamChannel {
+export class StreamDispatcher extends Dispatcher<{ guid: string, stream: stream.Readable }, channels.StreamChannel, ArtifactDispatcher> implements channels.StreamChannel {
   _type_Stream = true;
   private _ended: boolean = false;
 
-  constructor(scope: DispatcherScope, stream: stream.Readable) {
+  constructor(scope: ArtifactDispatcher, stream: stream.Readable) {
     super(scope, { guid: 'stream@' + createGuid(), stream }, 'Stream', {});
     // In Node v12.9.0+ we can use readableEnded.
     stream.once('end', () => this._ended =  true);
diff --git a/packages/playwright-core/src/server/dispatchers/tracingDispatcher.ts b/packages/playwright-core/src/server/dispatchers/tracingDispatcher.ts
index 07a849b73e..84ab9786e2 100644
--- a/packages/playwright-core/src/server/dispatchers/tracingDispatcher.ts
+++ b/packages/playwright-core/src/server/dispatchers/tracingDispatcher.ts
@@ -30,7 +30,7 @@ export class TracingDispatcher extends Dispatcher<Tracing, channels.TracingChann
   }
 
   constructor(scope: BrowserContextDispatcher | APIRequestContextDispatcher, tracing: Tracing) {
-    super(scope, tracing, 'Tracing', {}, true);
+    super(scope, tracing, 'Tracing', {});
   }
 
   async tracingStart(params: channels.TracingTracingStartParams): Promise<channels.TracingTracingStartResult> {
@@ -43,7 +43,7 @@ export class TracingDispatcher extends Dispatcher<Tracing, channels.TracingChann
 
   async tracingStopChunk(params: channels.TracingTracingStopChunkParams): Promise<channels.TracingTracingStopChunkResult> {
     const { artifact, sourceEntries } = await this._object.stopChunk(params);
-    return { artifact: artifact ? new ArtifactDispatcher(this._scope, artifact) : undefined, sourceEntries };
+    return { artifact: artifact ? new ArtifactDispatcher(this, artifact) : undefined, sourceEntries };
   }
 
   async tracingStop(params: channels.TracingTracingStopParams): Promise<channels.TracingTracingStopResult> {