FontVariation embolden appears different thickness in different window size

[abcjjy]

Tested versions

4.2stable

System information

Godot v4.2.stable - macOS 13.6.1 - GLES3 (Compatibility) - ANGLE (AMD, ANGLE Metal Renderer: AMD Radeon Pro 560X, 版本13.6.1（版号22G313）) - Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz (12 Threads)

Issue description

The first screenshot is taken from a 546x854 window. The second one is taken from 1528x1982. Same FontVariation with embolden=0.5.

Steps to reproduce

Create a FontVariation and set embolden = 0.5. Create a label with that FontVariant. Play in editor and drag the window size to see the font thinkness change.

Minimal reproduction project (MRP)

N/A