I turned up this exception. This one’s from a patch that uses a fairly long chain of texture filters.
‘BlurPerfector’ in particular seems like a culprit. The output looks like a normal map.
Side note, is there a performant way to change texture types? INTZ textures go in and out of texture filters as INTZ textures (unless I manually change the filter) and read the depth of the grid resulting in a blank white output.