Synthetic bold applies to a label instead of "Bold" Font Weight when using Fallback Font Asset

How to reproduce:
1. Open the attached “Test Font Asset Fallback.zip” project
2. In the Project tab, select the “Assets” folder
3. In the “Assets” folder, select the “NewUXMLTemplate” asset
4. Observe the Viewport window

Actual result: The text on line 3 is bolder than the text on line 4
Expected result: The text on lines 3 and 4 looks the same

Reproducible with: 2023.2.0a1, 6000.0.70f1, 6000.3.10f1, 6000.4.0b11, 6000.5.0a8
Could no test with: 2023.1.0a3 (crashes when opening UI Toolkit or assigning a font asset to a text)

Reproducible on: macOS 15.3.2 (24D81) (M1 Max)
Not reproducible on: No other environments tested

Note: Reproducible in Player