Repository: flutter
Issue: [Semantics / Accessibility ] Expanded property doesn't announce anything 
Labels: framework,a: accessibility,has reproducible steps,P2,team-framework,triaged-framework,found in release: 3.16,found in release: 3.17

### Is there an existing issue for this?

- [X] I have searched the [existing issues](https://github.com/flutter/flutter/issues)
- [X] I have read the [guide to filing a bug](https://flutter.dev/docs/resources/bug-reports)

### Steps to reproduce

1. Run the provided code on a real device, simulator or emulator (iOS or Android).
2. Use TalkBack(Android), VoiceOver(iOS), Accessibility Inspector(iOS) on a real device, simulator or emulator.
3. Select the Text element with the following value: 'Expanded Property Test'.
4. Listen!

---
My setup:
Android Emulator: Pixel API 33 - Android 13.0 Google Play | arm64
iPhone Simulator: iPhone 14 Pro Max - iOS 17.0

### Expected results

I would expect that the 'Expanded' state would be announced, or something related to it.

### Actual results

Nothing is being announced, and can't see anything related to the Expanded state in the Accessibility Inspector.

### Code sample

<details><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Semantics(
          expanded: true,
          child: const Text('Expanded Property Test'),
        ),
      ),
    );
  }
}

```

</details>


### Screenshots or Video

<details>
<summary>Screenshots / Video demonstration</summary>

[Expanded Property Test Video.webm](https://github.com/flutter/flutter/assets/50016143/47dc1aa3-1041-4be6-9942-67a2fccd0b9c)


![Screenshot 2023-11-22 at 13 17 48](https://github.com/flutter/flutter/assets/50016143/86e1b23e-ae79-4ead-9659-ec722d2eaf96)

</details>



### Logs

_No response_

### Flutter Doctor output

<details><summary>Doctor output</summary>

```console
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.16.0, on macOS 14.1.1 23B81 darwin-arm64, locale en-NL)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 15.0.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.3)
[✓] VS Code (version 1.84.2)
[✓] Connected device (3 available)
[✓] Network resources

• No issues found!
```

</details>