If you negate a small part that is rotated onto a larger part,i found that the new unions shadow is now really dark.
I found this when me and my friend were playing around with the new CSG API roblox added in, when making bullet holes in bricks for fun, this weird shading appeared,
Changing the collision type to box solves the problem, but leaves the block unable to be used in a map. (Holes in walls from explosions and other things)
I think this happens when the unions hitbox is rotated weirdly
repro file: weird shadows.rbxl (72.5 KB)
idk if this is just me or not please correct me