Substance painter and blender

Hey guys. I’m trying to import a mesh into substance painter. I get these artifacts at the “bake mash maps”. in blender the uv map actually looks okay. does anyone have any idea what I’m doing wrong?

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show UV and does it have only one UV channel?

I found the problem. I used boolean and the resulting faces are not unwrapped. after exporting to fbx, these faces are created and then simply lie on top.

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