Bug Player Simulator/Morph



playing on Direwolf20 1.12.2(1.3.0 release)
I was integrated tunnels Player Simulator for a Mob farm when ever it attack and kill mob caused the sever to crash.
From reading the crash report it believed that Morph has attempt to give the Player Simulator the morph of the mob resulting in a crash and the deleting of the item that the Player Simulator was using at the time, to my understanding.
before the 1.3.0 update this wasn't an issue the farm had before