fix: improve frame session management (#13022)

Author: OrKoN

packages/puppeteer-core/src/cdp/Frame.ts

@@ -322,12 +322,8 @@ export class CdpFrame extends Frame {
 
   @throwIfDetached
   async addPreloadScript(preloadScript: CdpPreloadScript): Promise<void> {
-    // TODO: this might be not correct and we might be adding a preload
-    // script multiple times to the nested frames.
-    if (
-      this.#client === this._frameManager.client &&
-      this !== this._frameManager.mainFrame()
-    ) {
+    const parentFrame = this.parentFrame();
+    if (parentFrame && this.#client === parentFrame.client) {
       return;
     }
     if (preloadScript.getIdForFrame(this)) {

packages/puppeteer-core/src/cdp/FrameManager.ts

@@ -407,11 +407,10 @@ export class FrameManager extends EventEmitter<FrameManagerEvents> {
   ): void {
     let frame = this.frame(frameId);
     if (frame) {
-      if (session && frame.client !== this.#client) {
-        // TODO: check this condition. It might not be correct for
-        // nested frames.
+      const parentFrame = this.frame(parentFrameId);
+      if (session && parentFrame && frame.client !== parentFrame?.client) {
         // If an OOP iframes becomes a normal iframe
-        // again it is first attached to the parent page before the
+        // again it is first attached to the parent frame before the
         // target is removed.
         frame.updateClient(session);
       }