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This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request) Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request. ### Issue Link: What is the link to the issue this cherry-pick is addressing? https://github.com/flutter/flutter/issues/173474 ### Changelog Description: Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples `PlatformDispatchers.instance.engineId` returns `null` after hot restart ### Impact Description: What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch) It affects anyone who uses engineId while in development (since it happens after hot-restart). ### Workaround: Is there a workaround for this issue? Not doing any hot-restarting while development which is not ideal. ### Risk: What is the risk level of this cherry-pick? ### Test Coverage: Are you confident that your fix is well-tested by automated tests? ### Validation Steps: What are the steps to validate that this fix works? Running this app and hot restarting no longer prints null: ```dart class MyApp extends StatefulWidget { const MyApp({super.key}); @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { @override void initState() { super.initState(); print('engineId: ${PlatformDispatcher.instance.engineId}'); } // ... } ```
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