"ArgumentOutOfRangeException" is thrown removing a Keyword Declaration Overrides after adding and reverting one of them

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, name it
4. Apply the changes
5. Add another Keyword Declaration Override
6. Click "Revert"
7. Remove the first Keyword Declaration Override using the "-" button
8. Observe the Console

Actual results: An "ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection." error is thrown

Expected results: Nothing is thrown and the first Keyword Declaration Override is removed

Reproducible with versions: 6000.3.0a6, 6000.3.16f1, 6000.4.8f1, 6000.5.0b10,, 6000.6.0a5

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