"NullReferenceException" is thrown when applying or reverting Shader Build Settings after entering Play Mode

Steps to reproduce:

1. Create and open a new project 
2. Open Project Settings -> Graphics -> Shaders
3. Add a new Keyword Declaration Override using the "+" button
4. Enter Play Mode
5. Click "Revert" on the prompt dialog box
6. Observe the Console

Actual results: An "NullReferenceException: SerializedObject of SerializedProperty has been Disposed." error is thrown

Expected results: Nothing is thrown in the Console

Reproducible with versions: 6000.4.9f1, 6000.5.0b10, 6000.6.0a6

Could not test with versions: 6000.3.0a6, 6000.3.16f1, 6000.5.0b9, 6000.6.0a5 (No Unsaved Changes dialog box)

Tested on (OS): Windows 11 Pro (25H2)

Notes:

• In 6000.3.0a6, no prompt was asked when entering Play Mode
• Also reproducible by forcing a script recompile
• Might need to be reproduced twice to trigger the NullReferenceException