Yes, when you ask a question directly under a Lesson, the first post doesn’t accept images (this is a known bug, it will be fixed at some point).
So this was not the problem I thought. It is caused by the Bevel Modifier…
Check your Mesh for Double Vertices and make your Normals consistent (just in case).
So: A (to Select all) then M > Merge > By Distance, followed by SHIFT+N.
Maybe that doesn’t fix everything, but we’ll have a better starting point to troubleshoot, if necessary.
