I think that is what the modern converter from Ken1171 avoids. from what I've read on it it will convert an entire play set with proper size and mat zones. It's bad enough when I buy an actual Poser prop that is super old and all zones need to be re-mat/shaded for P12. I'm still on the fence about it all cause I'd have to buy a lot of D3D stuff to justify buying the converter script.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740