What does "Invalid clnors in this fan!" mean? When I open or render a frame of one specific scene, I have several messages in the Console with the note "Invalid clnors in this fan!"



This message also shows up when I try command line rendering.

I'm having problems rendering this and other scenes from the same project.

What is causing this problem?
Clnors stands for Custom Loop Normals.

This happens when clnors are not equal to each other where they should (would have to see the geometry), this message is printed and they are all replaced with their average value to be equal.