I don't know if this is a bug but something is wrong.
The same free texture from megascans.
Simple cube 2m x 2m x 2m and two different projection: UVW Mapping nad Cube 1m x 1m x 1m
Two versions with and w/o albedo textures. Bump with corona normal shader - 100%.
Someone can confirm this problem?
Windows 7 + Cinema 4D R20 + Corona 5 hotfix 2