Face out of UDIM bounds and baking errors

I have two issues with with my project, but I'm not sure if they're connected. When i import my model, I see an error in the log stating that part of the model has "faces in out of bounds UDIM indices [0, -1]". The part of the mesh with these problematic faces is named, but when I go back into Maya and check it, the faces on that mesh are not out of bounds at all.

I'm trying to get ambient occulusion and curvature maps from substance painter to use in Mari, but when I do the bake with this same mesh, the result is completely messed up and I've never had this happen before, so I have no idea what's going on.

Are the out-of-bounds faces causing this baking issue? Or is it something else? I've attached screenshots of the error message, the uv faces referenced, and the botched bake result:

error.pngout of bounds faces.pngbake result.png