Flutter中HitTestBehavior.translucent表现异常且结果不一致？

我原本以为HitTestBehavior.translucent的行为逻辑是：当Stack中子组件A在B的视觉层级后方时，点击A和B的重叠区域，会同时触发两个组件的点击回调。但经过代码测试后发现实际表现并非如此，甚至存在不一致的情况，完全不符合预期。

我的预期逻辑：

• 当B的behavior设置为translucent时，点击B应同时将点击事件传递给后方的A，触发A的点击回调
• 当B的behavior设置为opaque时，点击B仅触发自身的点击回调
• 当B的behavior设置为deferToChild时，点击B的处理逻辑由其子组件决定

但从测试日志可以看到，即使明确将behavior设置为translucent，在同一位置快速多次点击时，有时点击事件会传递到后方的组件，有时则不会，表现出明显的不一致性。

复现代码 #

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: GestureDetector(
      onTapDown: (_) {
        print('outer gd tapped');
      },
      child: Container(
        color: Colors.red,
        width: 500,
        height: 500,
        alignment: Alignment.center,
        child: GestureDetector(
          behavior: HitTestBehavior.translucent,
          onTapDown: (_) {
            print('inner gd tapped');
          },
          child: Container(
            color: Colors.cyanAccent,
            width: 200,
            height: 200,
          ),
        ),
      ),
    ),
  );
}

应用界面 #

界面包含一个500×500的红色容器，其中心位置嵌套了一个200×200的青色容器。

测试日志 #

快速多次点击青色容器后，日志输出如下（可见部分点击触发了后方红色容器的回调，而点击位置始终未变）：

flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: inner gd tapped
flutter: outer gd tapped    <---------- 此处异常
flutter: inner gd tapped
flutter: outer gd tapped    <---------- 此处异常
flutter: inner gd tapped
flutter: outer gd tapped    <---------- 此处异常
flutter: inner gd tapped
flutter: outer gd tapped    <---------- 此处异常
flutter: inner gd tapped

内容的提问来源于stack exchange，提问作者Haidar