102eff0bd4
In the report, the geometry is copied because it has two users and the final join node needs to write to it. The join node also happens to remove attributes apparently, because it exposed a mistake in the "copy" method of the `MeshComponent` class. The copy is supposed to be a deep copy, but the vertex group name map was not duplicated. Differential Revision: https://developer.blender.org/D9991