Duplication Glitch using a sticky piston, chest and button. Dose not take way achievements.

The way that you do this glitch is with a sticky piston button and chest. When you press the button open the chest when it get pushed up right before it goes back down take the item out of the chest. This glitch really ruins the game because it make getting achievements easy and takes no effort. Please let me know when this will be fix. This needs to be fixed right away.