horse/donkey duplication glitch

if you put stuff in the donkey chest ride the donkey leave the game while still on the donkey come back in the game there is two donkeys and both donkeys have the same stuff in the chest so if you put 11 diamonds in your donkey ride it log out and come back in there will be two donkeys with 11 diamonds in each donkey. same for horses it doubles the horse armor and saddles