Duplication Glitch/Bug

Me and my friends figured out that you can use Redstone and comparators to make a chest that moves on a piston by placing the chest on the piston. if you withdraw anything from the chest as it moves it will be duplicated. it takes perfect timing but with practice can be done easily. the delay on the circuit from the comparators gives you time to move to the chest and open it and withdraw anything as it moves. We want to play the game without the possibility of this glitch so im reporting it. let me know if you want to see an example.