This doesn’t change with material, any render settings nor is it the same ‘type’ of model that shows wrong. It does this whether HDRI is enabled or not, reflection control doesn’t help, and neither does adding any lighting. If I remove a ‘sky’ object sync, and then add it back in to sync again it comes straight back in as sky once more.
I’m finding TM in general to be terrible with handling materials in general. Primarily work with Revit for Architectural model and have used Datasmith export and manually FBX exported and on different machines and I always seem to get the same kind of problems.