Random out-of-bounds rects in keep-optimal-aspect-ratio in GL Compatibility

[hydroper]

Godot version

4.0.rc2

System information

Windows 11, gl_compatibility

Issue description

I've confirmed this bug does not happen in forward_plus renderer.

Steps to reproduce

I did this in my project:

• Display > Window > Stretch > Mode = viewport
• Display > Window > Stretch > Aspect = keep
• Display > Window > Stretch > Scale = 1
• Main Scene: A Node2D

However, when I create a new project I don't reproduce the problem, so please look at the minimal reproduction project, which is my project still in development (pretty short).

Minimal reproduction project

godot_optimal_ratio_demo

[hydroper]

It works perfectly in forward_plus renderer. The out-of-bounds area is rendered as black.

[hydroper]

Tried in 4.0.rc2 now and same issue.

[clayjohn]

Duplicate of #71799 closing this so we can track the issue in one place