Sometimes, when I export a mesh, the PLY or OBJ has rectangular holes, as if some of the mesh parts were not included.
When I export the same mesh again, all is fine.
I can’t reliably reproduce the error in any file, but it has happened several times with the same file, too.
This is not a big problem, but just annoying, as it can cost significant time to go all the way back and re-export, especially when only a small part of a huge model is missing and I have already done extensive post-processing.
There seems to be no logical trigger - I normally do not touch anything during export, so closing the project too early or so is not the reason.