Overlapping Lightmap UVs Generated When Not In None LOD Group

Overlapping lightmaps are generated when the LOD group is not the default. Setting the LOD group to None and rebuilding lighting doesn't have the same result.

Found in 4.24 CL# 10570792
Reproduced in 4.25 CL#10719465

1. Import the attached mesh. Don't create lightmaps on import.
2. Place the chair in a level.
3. Build lighting.
4. Open the chair mesh and change the LOD group to Large Prop.
5. Rebuild the lighting.
6. Look at the chair.

Result: Overlapping UVs are generated.

Expected: Overlapping UVs are not generated.