[Bug report] 混合项目提示this is not the flutter project

### Version

5.1.3

### Platforms

Android

### Device Model

android

### flutter info

```sh
和flutter无关
```


### How to reproduce?

在android项目中导入flutter_module，做成混合模式，调用插件时会提示This is not the flutter project.
需要使用IDE单独打开flutter_module，才能正常调用插件。

### Logs

_No response_

### Example code (optional)

```Dart
可以参考官方add_to_app中的multiFlutter
```


### Contact

_No response_