How to reproduce:
1. Create a new project
2. Go to Preferences -> General, under "Editor Font" select "System Font" and under "Editor Default Text Rendering Mode" select "Bitmap"
3. In Preferences window, select categories like General, Physics, Colors, etc
4. Observe the title text of the selected category

Expected result: The title text appears as usual with no issues
Actual result: The title text has a small, white rectangle in the bottom right corner of it

Reproducible with: 6000.0.62f1, 6000.2.12f1, 6000.3.0b2, 6000.3.0b10, 6000.4.0a4, 6000.5.0a1
Not reproducible with: 6000.0.1f1, 6000.3.0b1 (0470b869db67)
Could not test with: 2023.1.0a1 ("Editor Default Text Rendering Mode" selection is unavailable)

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

Note: The issue is also present in other places with title text, but not everywhere. For instance, it is not present in the title of the Package Manager category in Preferences, but appears in the Inspector if the URP Empty Template "Readme" asset is selected