Reproduction steps:
1. Create a new project
2. Create UI Document (Create > UI Toolkit > UI Document)
3. Select newly created Asset
4. Observe the foldouts in the Inspector

Actual result: Some foldouts appear enabled even though all of the fields inside are disabled while other foldouts are disabled
Expected result: All foldouts that have all of their fields disabled are greyed out/disabled

Reproducible with: 2021.3.57f1, 2022.3.67f1, 6000.0.60f1, 6000.2.8f1, 6000.3.0b6, 6000.4.0a2

Reproduced on: Ubuntu 24.04, macOS Sequoia 15.4 (M4)