Bug report : sometimes when adding new 3D meshes, or lights they're not drawn

have added six cubes, and the first one, or last one ’ isn’t rendered ’ from the editor

the result looks like this

two cubes aren’t drawn to the screen

  1. this happens randomly, or it’s happened once for lights that somehow didn’t have an effect on the scene

  2. as a user it’s rather difficult to know what to do about this, and however deleting things sort of works to add them again later, or however it’s rather weird this even happens