This is the zero point of the zone (0, 0, 0) and for whatever reason some spawned visuals don't end up being properly assigned. This is obviously a bug somewhere along the line that I have been unable to reproduce. The odd thing is, no one seems to have encountered an "invisible" bear wandering around the world so I'm still not sure who these visuals belong to. I think the solution (for now) is to spawn the visuals away from the zero point to avoid these showing to players.