How to reproduce:
1. Open the attached “IN-130279“ project
2. Open the “OutdoorsScene“ Scene
3. In the Project window, select the “New Material” Material
4. In Scene view, observe the color of the Sphere GameObjects
5. In the Inspector, change the “TestColour“ value to any other value
6. In Scene view, observe the color of the Sphere GameObjects

Actual result: The color of the Spheres does not change
Expected result: The color of the Spheres changes to the value selected in the Inspector

Reproducible with: 2023.1.0a1, 6000.0.66f1, 6000.3.6f1, 6000.4.0b5, 6000.5.0a5

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

Notes:
- This behavior is also reproducible with Boolean keywords, which remain permanently stuck on the option assigned to 1
- This issue is not reproducible on graphics cards that do not support Ray Tracing
- Only reproducible in HDRP