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Strange shapes on lightmap

I have house mesh which is devided into 10+ parts. When I bake lightning in production mode on mesh’s corners starts appearing strange shapes (screenshots). UV is ok, lightmap resolution too.
What is that?

I mean these shapes (screenshots), environment is default skybox with sun height -1, I’m also have some blocking cubes around house mesh and lightmap resolution 256-512 (it’s all green in lightmap density) on every mesh, so I don’t think it’s light bleeding. I’m also noticed that these shapes has every mesh in scene.
P.S A bit later I can post screenshot of the house from outside