Parallax occlusion accepts texture samples, right? That’s where the problem is, I think, because texture objects can’t be plugged into it if it only accepts texture samples. So it needs a converter node of some kind to get the texture object into the world aligned node, and connect that to the texture sample which goes in the parallax occlusion node.
Texture Object >> WorldAlignedTexture >> __________ >> Texture Sample >> Parallax Occlusion
I tried something similar in connecting a texture object to the WAT, then a wire from XYZ pin of WAT to a texture sample, and it threw an error about ‘cannot go 3float to 2float’ since texture sample is 2D. So perhaps there’s a conversion node that converts texture3D (from XYZ pin of the world align node, or WAT) to texture2D (texture sample node) and it would work. Why isn’t there simply an option on the texture sample node to choose 2D or 3D? I might send in a feature request for it.