Hi, I'm getting a weird shadow artifact on my wall meshes where they contact. I've adjusted the UV's every which way at the proper spacing and even adjusted lightmap size and still can't get rid of it. Does anyone know a fix?

Development Rendering
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You may need to sew a few of the uv islands/shells together and lay them out in order rather than a quick peel.
I would try putting the connecting pieces side by side, even if you don’t want to sew them together.