I was reading about a bug with the logs on a truck. So I loaded a truck with logs and drove around to see what happened. Nothing happened until the truck tipped over. when tipped over, the logs turned into a rock.
I was recording it just in case and this is what happened.
EDIT: I found the bug. It's a modded rock model from a modded map named The Badlands that used the .xml code from the medium logs load. lol. It still maybe something to look into. I dunno but will just leave this here for others to see.
EDIT2; The rock causing this error has been fixed now and the map works fine now.