I happen to start texturing objects that all had messed up UVs. The Drapery and the paper. With the grid now on the objects I can see all the objects that have UV issues.
When I was doing test renders, I couldn't figure out why the drapery and paper weren't rendering properly. When I look at the UV editor, the UV's were there.
For the bust, since it was a photogrammetry scan, I knew that I can use the PxrRoundCube for texturing.
Problem Solving Solutions That Didn't Work
Turns out, that there were 2 sets on UVs and that the placement order matters (A LOT!) The 'map1' was the set as the default and, with all the models, did not have any faces in the UV space. All I had to do was flip the order of the UV sets and I HAVE WORKING TEXTURES!
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