Duplication glitch that can be done in survival. The glitch or bug will not turn off achievements. It also effects realms. PLEASE HELP!!!

This a bug that really does ruin the game of Minecraft on realms and off of realms. This glitch or really bug can be done in survival and you will still get achievements. The way the glitch works is by using a sticky piston and a chest. You put the chest on the sticky piston and then put like diamonds or wither heads in the chest or what ever you want to duplicate. You put a button on the chest and press it. Press the button as the chest goes up open it and right before the chest goes back down take the item that you want out the chest. Then you will have that item in the chest also now the same thing in your inventory. Now before you mark this as a copy of another one please let the community know when will you guys fix this issue. It makes the game not fun and the achievements useless to earn. Please let the community know when you all will fix this issue.