Reproduction steps:
1. Open the attached project “LightmapBug”
2. Open “Assets/TestScene” Scene
3. Open Window → Rendering → Lighting window
4. In the Lighting window press the “Generate Lighting” button
5. Wait for the lights to complete baking
6. Inspect the Scene view
Expected result: All three lights are baked similarly
Actual result: Some lights are baked differently from others that are using different materials with similar behavior
Reproducible with: 13.1.9 (2022.1.24f1), 14.0.4 (2022.2.2f1), 15.0.2 (2023.1.0a24)
Couldn’t test with: 10.10.1 (2020.3.43f1), 12.1.8 (2021.3.16f1) - The lights are not generated because of downgraded Shader Graphs
Reproducible on: macOS 13.0.1 (Intel), Windows 10