Reproduction steps:
1. Create a new project
2. Window > Package Management > Package Manager > Unity Registry
3. Select Entities package and click “Install” button
4. Click “Manage” button and select “Remove” option
Actual result: "ArgumentNullException: Value cannot be null.", "Assertion failed on expression: 'CurrentThread::IsMainThread()'" errors and warning are thrown
Expected result: No errors or warnings are thrown
Reproducible with: 6.5.0 (6000.5.0a7, 6000.5.0a8)
Not reproducible with: 1.4.5 (6000.3.10f1), 6.4.0 (6000.4.0b11), 6.5.0 (6000.5.0a6)
Reproduced on: macOS Tahoe 26.3 (M4), Windows 11
Note: FAV is in Editor versions