Repository: flutter
Issue: VoiceOver repeats same text or label property text of Semantics Widget on MacOS 12.5.1
Labels: framework,f: material design,a: accessibility,platform-mac,a: desktop,has reproducible steps,P2,found in release: 3.3,found in release: 3.4,team-macos,triaged-macos

**Expected results:** <!-- what did you want to see? --> 
normal voice  by VoiceOver on MacOS 12.5.1

**Actual results:** <!-- what did you see? -->
repeated same text or label property text of Semantics Widget  by VoiceOver on macOS 12.5.1 when using IconButton Widget alone and IconButton Widget with MergeSemantics.
<details>
<summary>Code sample</summary>

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```dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      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(
        title: Text(widget.title),
      ),
      body: Container(
        child: ListView(padding: const EdgeInsets.all(8), children: <Widget>[
          ListTile(
            leading: Text('Without MergeSemantics'),
            title: Text('Icon'),
            trailing: Semantics(
              label: 'tab for another option',
              child: Icon(Icons.arrow_forward_ios),
            ),
          ),
          const Divider(),
          ListTile(
            leading: Text('Without MergeSemantics'),
            title: Text('IconButton'),
            trailing: Semantics(
              label: 'tab for another option',
              child: IconButton(
                  icon: Icon(Icons.arrow_forward_ios), onPressed: () {}),
            ),
          ),
          const Divider(),
          MergeSemantics(
            child: ListTile(
              leading: Text('MergeSemantics'),
              title: Text('Icon'),
              trailing: Semantics(
                label: 'tab for another option',
                child: Icon(Icons.arrow_forward_ios),
              ),
            ),
          ),
          const Divider(),
          MergeSemantics(
            child: ListTile(
              leading: Text('MergeSemantics'),
              title: Text('IconButton'),
              trailing: Semantics(
                label: 'tab for another option',
                child: IconButton(
                    icon: Icon(Icons.arrow_forward_ios), onPressed: () {}),
              ),
            ),
          ),
        ]),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

```

</details>



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