Outside of sandstone ceiling wedges it looks like all the ceiling wedges top and bottom textures don’t match grain direction. When I build I place the ceiling wedges to make all the grain flow in a specific. It looks correct as a floor, but looking up as a ceiling the grain points in a different direction messing up the design.
Stable Ceiling have same issue, there no tell (like insulated wood ceiling have) which way panels are facing. So your kinda at RNG mercy when placing them.