This occurs on the most recent released version of AW, ancientwarfare-1.12.2-2.6.1.349, and Valkyrien Warfare version Valkyrien+Warfare+0.9_prerelease_5+[Optimization+Update].

So i was going to at least try to see what VW is doing there, but they don't have a dev environment friendly build so I only got crashes on starting my environment. Anyway it looks like the mod still needs a lot done to it primarily to fix a lot of incompatibility issues with other mods. So this issue really should go to them as they are the cause of this rendering issue.

closing this, nothing to be done on AW side