GL compatibility 3D scaling

[smallcloverstudio]

Godot version

4.0.2

System information

Ubuntu, Windows11

Issue description

when applying 3d scaling the viewport does not stretch to the window size.

Steps to reproduce

very simple:
with glcompatibility back-end

set rendering/scaling_3d/scale to "<1" in project settings

Minimal reproduction project

N/A

[clayjohn]

Duplicate of #70142

Please remember to search existing issues before opening one of your own.