threw _AssertionError:<'package:flame/src/components/core/component.dart': Failed assertion: line 627 pos 7: 'child._parent != null': Trying to remove a component that doesn't belong to any parent>

      testWithFlameGame(
        'Remove all children in onRemove',
        (game) async {
          final component = _RemoveAllChildrenComponent();
          component.addAll([Component(), Component()]);
          game.add(component);
          await game.ready();
          expect(() => game.remove(component), returnsNormally);
          expect(() => game.update(0), returnsNormally); // Here is the assertion.
        },
      );


class _RemoveAllChildrenComponent extends Component {
  @override
  void onRemove() {
    removeAll(children);
  }
}