Reproduction steps:
1. Open the attached “IN-103652.zip” project
2. Open the “SampleScene”
3. Open the Lighting Window (Ctrl+9)
4. Click Generate Lighting
5. Observe the Cube’s colors in the Game view (specifically the blue Cube on the right and smaller Cubes)
6. Open the Scene view
7. In the Scene view toolbar change the Draw Mode to Debug
8. Choose the “Baked Lightmap” mode
9. Observe the Scene view

Expected result: Cubes emit and reflect color corresponding to their original color
Actual result: The blue Cube emits and reflects red color, and the smaller Cubes emit incorrect colors

Reproducible with: 2023.1.0a20, 6000.0.50f1, 6000.1.6f1, 6000.2.0b4
Not reproducible with: 2022.3.62f1, 2023.1.0a19

Reproducible on: Windows 10 (user reported), Windows 11
Not reproducible on: no other environment tested

Note:
- Also reported on discussions: [https://discussions.unity.com/t/material-property-block-doesnt-work-with-backing-indirect-light/1569741|https://discussions.unity.com/t/material-property-block-doesnt-work-with-backing-indirect-light/1569741|smart-link]