Item duplication exploit (any item that is stackable)

on minecraft pocket edition in survival if you make a beacon any stackable item is able to be duplicated to do this you have to go to video settings and change from classic to pocket and then place the item you want to duplicate into your hotbar then click the beacon and tap it will then start the glitch this is a major exploit since any item that can be stacked can be duplicated I put a video to show you, i hope this helps you.