I have a model imported from Inventor.
I have applied various materials all over the model. Some of the parts, irrespective of the material applied, display as both a mirrored surface AND completely opaque.

It’s such a bizarre concept I can’t even get my head round it, to be honest.
Any ideas?
Yeah I think I’ve encountered the same several times. Click a part which is really wrong with the right button > edit normals and enter a number like 25 top left > apply > ok
Think it’s an issue with the normals.
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Maybe you can prevent it by exporting a bit different since it can be quite some work if you need to correct a lot of parts. It could also be that the model in Inventor has some flipped faces and in some software such faces get a different color/shade.