Game window kind of 'blinking' when camera2d attached.

Godot Version

4.4.1.stable.mono.official

Question

Hello, I am new to Godot and encountered a camera2d issue, it drives me crazy and I have exhausted my testing and searching. I can't describe it very precisely, so I upload the demo project here, just a few lines of c# code and a small scene. You will notice the movement difference when the camera2d node is removed. The project uses mouse right button to move. https://github.com/linbaiye/camera_demo

Do you happen to show a video?

Not allowed to upload videos, let me gain some levels then upload.