When running a scene, the Game Window flashes one second before it starts

[Ughuuu]

Tested versions

4.3

System information

macos air m1

Issue description

When running a scene, the new window flashes/blinks before it starts (after loading). Godot doesn't do this. I'm talking about the transition from darker window to regular window.

Screen.Recording.2024-11-04.at.10.32.14.mov

Also, sometimes it just doesn't start or takes very very very long time to start:

Screen.Recording.2024-11-04.at.10.31.13.mov

It's possible this is because I am running the engine from terminal, though this should be a release build, it shouldn't take this long to start a scene.

Steps to reproduce

Open empty scene and run a project.

Minimal reproduction project (MRP)