Hi Norb,
I don’t know exactly what is causing this, but if you open the file in blender 3.2 (I also tried 3.3.0, that also worked), then try to Bake, you’ll get a Warning that the Mesh should be Unwrapped, but it already is, so: switch to Edit Mode, then back to Object Mode (now Blender should realise that the Mesh is already Unwrapped) and (say a prayer and) press Bake:
