How to reproduce:
1. Open the attached “IN-134164” project
2. Open the “SampleScene”
3. Open the “Test” UXML file in UI Builder
4. Select “Label” in the Hierarchy
5. In the Inspector, go to Text portion and find Letter Spacing
6. Click and drag on the field name to change the value
7. Observe the Game view
Actual result: The spacing between letters changes, with the left letters going further away than the right counterparts
Expected result: The spacing changes, but the change appears even between left and right side
Reproducible with: 6000.0.67f1, 6000.1.0a9, 6000.3.9f1, 6000.4.0b9, 6000.5.0a7
Couldn’t test with: 6000.1.0a8 (Letter Spacing did not work)
Reproducible on: macOS 26.2 (M1 Pro), Windows 10 (user)
Not reproducible on: No other environments tested
Note: The issue does not reproduce when Text Generator Type is set to Standard