How to reproduce:
1. Open the attached “IN-133449_texture2d” project
2. Open the “OutdoorsScene” Scene
3. In the Hierarchy select the “Sky and Fog Volume” GameObject
4. Change the “DummyPP” overrides Intensity value to any value above 0
5. Observe the Game or Scene Viewport
Actual result: Game and Scene Viewports become grayed out
Expected result: Game and Scene Viewports remain as they were
Reproducible with: 2023.1.0a1, 6000.0.70f1, 6000.3.10f1, 6000.4.0b11, 6000.5.0a8
Reproducible on: Windows 11
Not reproducible on: No other environments tested