I have multiple ProBuilder objects in my project. Now I noticed that some of them are broken. I have three behaviours: The object works as expected (about 50 % of objects) The object is not editable. No error present. If I try to export it or make it into a prefab, all the geometry disappears and the object has size 0,0,0 and complaints about missing normals and UVs. If I reload the scene the object re-appears. The same as above, but the object disappears as soon as I select the object in inspector. Unity 2018.3.1f1 with ProBuilder 4.0.2 . EDIT: Edited the ProBuilder ver. no.