Front texture of the Copper Doors with hinge: right blockstate and back texture of Copper Doors with hinge: left blockstate have inconsistent shading in their textures when compared to surrounding copper blocks. Issue is present with all Copper Door oxidation levels, pictured in attachments is only un-oxidized variant because the issue is most prevalent.

The shading direction for all copper blocks is generally a streak from bottom left to top right. The shading direction for the problematic Copper Door blocks are from bottom right to top left.

Suggested solution: Create an additional texture for Copper Doors with just the shading flipped, and apply it to the front of right hinged and back of left hinged Copper Doors.