Steps to reproduce:
1. Create a new project
2. Open UI Toolkit Debugger window (Kebab menu on any of the windows > UI Toolkit Debugger)
3. Press “Pick Element” button and select Inspector window
4. Select first dropdown in the UI Toolkit Debugger window
5. Change Usage Hint value to Everything
6. Observe the Inspector window
7. Change Usage Hint value back to Nothing
8. Observe the Inspector window

Actual results: Errors are thrown, Inspector window items are zoomed in and changing Usage Hint value back does nothing
Expected results: Nothing of note happens

Reproducible with versions: 6000.3.0a1, 6000.3.0a6
Not reproducible with versions: 2021.3.55f1, 2022.3.66f1, 6000.0.56f1, 6000.1.16f1, 6000.2.0a10, 6000.2.2f1

Tested on (OS): Windows 11, macOS Sequoia 15.4 (M4)

Notes:

• Restarting Editor solves the issue
• Selecting other dropdown elements and changing their Usage Hint value either does not reproduce the issue or changes are undone after changing the value back

• Changes can be undone in 6000.2.0a10-6000.3.0a3 versions