How to reproduce:
1. Open the attached user project “PointLight-Lightmap-Issues.zip“
2. Open the “SampleScene“ Scene
3. Open the Lighting window (General>Rendering>Lighting)
4. Press “Generate Lighting“

Expected result: The “Functional Point Light“ still produces light
Actual result: There is no light coming from the “Functional Point Light“ GameObject

Reproducible with: 2020.3.45f1, 2021.3.15f1, 2022.2.1f1, 2023.1.0a16
Not reproducible with: 2020.3.48f1, 2021.3.24f1, 2022.2.18f1, 2023.1.0b15, 2023.2.0a13
Fixed in: 2020.3.46f1, 2021.3.16f1, 2022.2.2f1, 2023.1.0a17

Reproduced on: macOS 13.0.1 (Intel), Windows 10 (by reporter)

Notes:
- Issue is reproducible in Builds
- Undoing the deletion of the “Functional Point Light“ GameObject after baking causes it to emit light again until the Scene is reloaded
- New Point Lights created after baking also function normally (including those created by copy-pasting a broken one)