Pause Demo 4.0-dev not working

[voylin]

Which demo project is affected:
https://github.com/godotengine/godot-demo-projects/tree/4.0-dev/misc/pause

OS/device including version:
Arch Linux LTS-5.15.31-1 with i3 window manager

Issue description:
Cube doesn't rotate and errors keep happening

[voylin]

I fixed the issues in a different branch like recommended. I'm making a pull request soon.