No material on mudflaps for a select few trailers and few other things too

I don't know if this is an issue on my side or beamNG's side, but i had these "No material" but on a speedometer and some mudflaps. The speedometer thing started from 0.30 but the mudflaps issue started just after the 0.31 update. I tired restarting lua, deactivating all mods, checking for broken mods but nothing worked.
If this issue is update related or if its just me, please do let me know how to fix it!
(I have no clue why the file is so big but it is a vid showing few things that have the bug)