我想使用MultiBlocProvider，如下所示。

如何在flutter tree控件中使用特定级别的MultiBlocProvider？
换句话说，当我们在MaterialApp的top上使用MultiBlocProvideron时，没有任何问题，但是根据下面的代码，这个项目会得到一个错误。
示例：

void main() {
  runApp(MaterialApp(
    onGenerateRoute: (settings) {
      switch (settings.name) {
        case "/":
          return MaterialPageRoute(
              builder: (_) => MultiBlocProvider(providers: [
                    BlocProvider(
                      create: (_) => CounterBloc(),
                    )
                  ], child: const GroupA()),
              settings: settings);
        case "/ScopeA":
          return MaterialPageRoute(
              builder: (_) => const ScopeA(), settings: settings);
        default:
          return MaterialPageRoute(
              builder: (_) => const Text("ERROR"), settings: settings);
      }
    },
  ));
}

class GroupA extends StatelessWidget {
  const GroupA({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Group A:')),
      body: Center(
        child: MaterialButton(
            onPressed: () => Navigator.pushNamed(context, '/ScopeA'),
            child: const Text("Go To Scope A")),
      ),
    );
  }
}

class ScopeA extends StatelessWidget {
  const ScopeA({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Scope A:')),
      body: Center(
        child: BlocBuilder<CounterBloc, int>(
          builder: (context, count) {
            return Text(
              '$count',
              style: Theme.of(context).textTheme.displayLarge,
            );
          },
        ),
      ),
    );
  }
}

abstract class CounterEvent {}

class CounterIncrementPressed extends CounterEvent {}

class CounterDecrementPressed extends CounterEvent {}

class CounterBloc extends Bloc<CounterEvent, int> {
  CounterBloc() : super(0) {
    on<CounterIncrementPressed>((event, emit) => emit(state + 1));
    on<CounterDecrementPressed>((event, emit) => emit(state - 1));
  }
}

i使用以下版本： Flutter 阻塞：8.1.2区块：8.1.1
错误：
错误：无法点击测试从未布局过的渲染框。