Thank you so much for all the tips, that is deffinetly something I will use in the future. In regards to reproducing the problem, I don´t know, we ended up making a completely new model, and the problem never returned.
Hi! Doing a bake with the attached files in Painter, didn't reveal the issues you show in your original post. The file contains just a single door element. Maybe the issue you presented is caused by the way UVs are stacked and due to the bake settings? Did you bake with your test file as well and reproduce the issue? That…