UI renders with black bars and overlapping icons when Windows scale is 150% and Unity scale is 125%

How to reproduce:

1. In Windows Display Settings, change display scale to 150%
2. Create a new project in Unity
3. Navigate to Edit -> Preferences -> UI Scaling
4. Uncheck “Use default desktop settings”
5. Set “Use custom scaling value” to 125%
6. Restart the Editor
7. Observe the Editor windows and layout

Actual result: The Editor UI renders with black bars appearing around the edges of the windows
Expected result: The Editor UI scales properly and is displayed correctly, with clean window borders and properly aligned elements

Reproducible with: 6000.2.0a9, 6000.3.19f1, 6000.5.3f1, 6000.6.0a2 (64de5ee36373)
Not reproducible with: 6000.0.79f1, 6000.2.0a8 (6bc6fbc26ac6), 6000.6.0b3, 6000.7.0a2
Fixed in: 6000.6.0a3

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: Depending on the screen and resolution, UI icons in the upper right corner may also overlap each other