I was left wondering if it was a bug or setup error. That’s because I saw that it had been fixed in 5.4.
I attached the images. First I tried with 10 in Lightmapping resolution and than with 40, but the issue continues.
This is a bug or settings?
Does the problem disappear when you clear baked data (i.e. clear lightmaps)?
(I’m just a user but I’m seeing a vaguely similar problem related to Allegorithmic Substances that survives lightmap clearing.)
@Arkade ,
Yes, I tried clear baked data, no changes.
So what tells you this relates to light mapping? (If you’ll forgive the impudent question – meant to help!)
Looks like overlapping lightmap UVs. Try turn on “Generate Lightmaps UVs” in the import options of your meshes.
Because this is a image with NO lightmaping. The Black Spots appears after baked the lights.

Hey @GeekCats
As @pojoih_1 righteously said, it seems that you have overlapping UVs on your mesh, please consider enabling Generate Lightmap UVs option from the import settings of your mesh.
If not try setting backface tolerance to zero in case this is a single-sided mesh, see how you can do that through this post: https://forum.unity3d.com/threads/progressive-lightmapper-in-5-6-beta-6.454362/#post-2944834
Thanks!
WORKS!!!
@Arkade , @pojoih_1 and @kemalakay
Thanks a lot!!!

