Reproduction steps:
1. Open the attached “ShaderVariantLimit.zip” project
2. Enter the Play mode
3. Exit the Play mode
4. Edit the value of “Shader Variant Limit” to any other value (Edit > Project Settings > ShaderGraph)

Expected result: The value changes
Actual result: “NullReferenceException: Object reference not set to an instance of an object” is thrown and the value reverts to the previous entered value

Reproducible with: 2022.3.38f1, 6000.0.11f1
Couldn’t test with: 2021.3.40f1 (Shader Variant Limit option in the Project Settings is not present)

Reproducible on: macOS 14.5 (M3 Max) (User reported), Windows 11
Not reproducible on: No other environment tested

Notes:
- Does not seem to reproduce if the Play mode has not been entered before editing the value
- Sometimes does not reproduce after restarting the Editor and editing the value right away
- Reproducible on a new project