Reproduction steps:
1. Open the attached "repro_IN-94136" project
2. Open the "Assets/Test.unity" Scene
3. Open the UI Builder ("Window -> UI Toolkit -> UI Builder")
4. In the UI Builder Hierarchy, select the "Label" element
5. In the UI Builder Inspector, expand all of the sections
6. Change any parameter and save by pressing the "Ctrl + S" button combination on your keyboard or by pressing the "Save" button ("File -> Save")
7. Scroll around the Inspector and observe the sections
Expected result: All of the Inspector sections are painted
Actual result: Some Inspector sections are not painted
Reproducible with: 2023.3.0a9, 6000.0.36f1, 6000.1.0b5, 6000.2.0a2
Not reproducible with: 2022.3.57f1, 2023.3.0a8
Fixed in: 6000.2.0a4
Reproducible on: Windows 10 (22H2), Windows 11 (23H2) (user's environment)
Not reproducible on: No other environments tested