UE5.4 Lightmap has wierd black grids





In the picture is the problem.
I only get that kind of black grids inside the rooms. In the corridor the lightmap looks fine.
I already tried to build the lightmap at production quality, but the problem still remained.
Anyone help please :sob:

The lightmap is on UV1, is this UV1?

Yes it is UV1. It is generated by the unreal engine and is used as lightmap UV

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