跳转黑屏

3.0版本跳转出现黑屏。
安卓华为原生页面A跳转到flutter A页面，再弹框跳转到flutter B页面，然后再弹框跳转到flutter A页面或者跳转到原生页面A会出现黑屏。
出现黑屏时物理按键导航返回无反应。
弹框跳转时复现明显，而且跳转到已存在的相同名字的页面复现明显。

Reproduce the flow on a Huawei Android device: native page A to Flutter A, modal to Flutter B, then modal or navigation back to Flutter A or native A. Observe the black screen and unresponsive physical back navigation, especially when navigating to an existing page with the same name. Done means the affected navigation paths render correctly and back navigation responds.

Written by the indexing model from the issue text.