How to reproduce:
1. Download Blender and make it a default application for “.blend“ files (Reason for this in the comments)
2. Open the “ReproProject“ project
3. Open the “ReproScene“
4. Enter the Play Mode
5. Wait for a bit for the meshes to load
6. Observe the Game view

Expected result: No light artifact
Actual result: Light artifact appears around “StandLampLightson” GameObject

Reproducible with: 2022.3.49f1, 6000.0.23f1
Could not test with: 2021.3.44f1 (Some scripting properties not present that are required for reproduction)

Reproducible on: macOS 14.6.1 (Intel), Windows 10 Pro (Reporters)
Not reproducible on: No other environments tested

Notes:
- Seems to depend on the light elements in the merged mesh has different pivot points in the world
- According to the reporter did not reproduce on a new project, even after migrating the merged mesh
- If you navigate to the “StandLampLightson“ after entering the Play Mode and change the Near Plane value to be “<0.34” the artifact will appear, if it “>0.34“ artifact will not be visible anymore
- Lights that are not merged perform as expected