How to reproduce:
1. Open the attached “IN-87058” project
2. Open the “SampleScene”
3. Enter Play mode
4. In the Hierarchy, select the “Test” GameObject
5. In the Inspector, try changing the values of the Transform’s y-rotation field
6. Observe the result
7. Exit Play mode
8. Open the “Test.cs” script attached to the “Test” GameObject
9. Uncomment line 16, save the changes, and close the code editor
10. Repeat steps 3 to 6

Expected result: It is possible to rotate the GameObject both before, and after uncommenting the code in step 9
Actual result: It is not possible to rotate the GameObject after uncommenting the code in step 9

Reproducible in: 2021.3.45f1, 2022.3.51f1, 6000.0.25f1, 6000.1.0a2

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

Note: Also affects transform.forward and transform.right