Item Duplication using Chests

Set up two pistons to push a chest back and forth with a brief delay.

Place the item you want duplicated into the chest,

Activate the pistons.

Just before the chest is pushed by the pistons, remove the item from the chest.

If timed right, when the chest updates in the new position it will contain a duplicate of the removed item.

A youtube demonstration is available at https://www.youtube.com/watch?v=WflwSSkLU1c

I had a user demonstrate this bug for me live yesterday, March 25, 2019 on a Dedicated Server runing 1.10.0.7. Clients were Android an Windows 10.

I did not find any reported issues regarding this bug, so I apologize if it has been reported.