Hi,
I installed Max 2021 and everything works nice there.
Unfortunately I can not send you the whole file since it is a test design from a client and under NDA.
I exported one part of a mesh for you but when I test-opened the smaller file the anisotropic settings are there but they do not appear in the big file under Max 2019.
When I imported the file into 2021 I did a scene convert to Arnold, maybe that fixed the problem becouse he changed every material to physical based.
My initial file is an export from a CAD software and I imported it to Max 2019 through FBX but I’m not sure why this could cause problems?