Try catch seems not working in async generator

try_catch_not_working_in_async_generator.dart

Stream<String> test1(Future<String> future) async* {
  try {
    yield "a";
    yield await future;
    yield "b";
  } catch (ex) {
    yield ex.toString();
  }
  yield "c";
}

Stream<String> test2(Future<String> future) async* {  
  yield "a";
  yield await future.catchError((ex) => ex.toString()); 
  yield "c";
}


Stream<String> test3(void Function() action) async* {
  try{
    action();
  }catch (ex) {
    yield ex.toString();
  }
}


Stream<String> test4() async* {
  try {
    yield "a";
    yield await Future.error("error");
    yield "b";
  } catch (ex) {
    yield ex.toString();
  }
  yield "c";
}

Stream<String> test5() async* {  
  yield "a";
  yield await Future<String>.error("error").catchError((ex) => ex.toString()); 
  yield "c";
}


Stream<String> test6() async* {
  try{
    throw "error";
  }catch (ex) {
    yield ex.toString();
  }
}

Future<void> printStream(Stream stream) async => print(await stream.toList());

void main()  async {
  await printStream(test1(Future.error("error")));  
  await printStream(test2(Future.error("error")));
  
  await printStream(test3(()=> throw "error"));
  await printStream(test4());  
  await printStream(test5());
  await printStream(test6());
}