Geometry weird gray colorations on some islands no vertex colours

Hello, I’m having a couple of problems I can’t troubleshoot any further.
When I load this geometry, It has weird colouration around some UV islands on most textures I give it, but not when I give it the Alias master texture.

There are no vertex colours on the mesh, and everything renders just fine in other DCC.

When I import it using USD, this also doesn’t happen, but I can’t work like that because unreal doesn’t properly import everything yet.
walls_ng.zip (2.2 MB)