How to reproduce:
1. Create a new empty project
2. Open the UI Builder (Window -> UI Toolkit -> UI Builder)
3. Add any element (for example, a Visual Element)
4. In the UI Builder Inspector, select any of the foldout menus
5. Press Tab repeatedly to cycle through the foldout elements
6. Observe the result

Expected result: All the foldout menus are reachable by navigating with the Tab key
Actual result: Not all the foldout menus are reachable when navigating with the Tab key

Reproducible in: 2023.3.0a8, 6000.0.16f1
Not reproducible in: 2021.3.43f1, 2022.3.44f1, 2023.3.0a7

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