https://github.com/flutter/flutter/issues/97750

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  // Auto-enable accessibility for our Blind and Low Vision customers.
  RendererBinding.instance?.setSemanticsEnabled(true);

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: MyStatefulWidget(),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return Column(children: [
      TextButton(
        onPressed: () => showDialog(
          context: context,
          barrierDismissible: false,
          builder: (BuildContext context) => AlertDialog(
            title: const Text('This title is not announced'),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(context),
                child: const Text('Neither is this button'),
              ),
            ],
          ),
        ),
        child: const Text('showDialog with issue'),
      ),
      TextButton(
        onPressed: () => showDialog(
          context: context,
          barrierDismissible: false,
          builder: (BuildContext context) => AlertDialog(
            // Workaround: Exclude the title from the semantics tree.
            title:
                const ExcludeSemantics(child: Text('This title is announced')),
            actions: [
              TextButton(
                autofocus: true, // Workaround: Autofocus the node.
                onPressed: () => Navigator.pop(context),
                // Workaround: Add back the title to the semantics tree.
                child: Semantics(
                  label: 'This title is announced',
                  child: const Text('So is this button'),
                ),
              ),
            ],
          ),
        ),
        child: const Text('showDialog with workaround'),
      ),  
    ]);
  }
}