How to reproduce:
1. Open the attached “IN-96508” project
2. Open the “MainMenu” Scene
3. Generate the lighting by going to Lighting > Scene > Generate Lighting
4. In the Project window, go to Assets > Materials and select “BaseMaterial” to view it in the Inspector.
5. Observe the result in the Material preview window

Expected result: Material renders smoothly
Actual result: Material is rendered with artifacts

Reproducible in: 6000.0.0b16, 6000.0.43f1, 6000.1.0b11, 6000.2.0a7
Not reproducible with: 2022.3.60f1, 2023.3.0b10
Could not test with: 6000.0.0b11 - 6000.0.0b15 (Materials are broken)

Reproducible on: Windows 11, MacOS 15.3.1 (M1 MAX)
Not reproducible on: No other environments tested

Note: Artifacts are shown differently per baked Scene.