Item Duplicator Bug

Disclaimer: This Bug works on all devices with the newest Minecraft Pocket Edition Version. We tried it on multiple devices on multiple operating systems.
How the summary already tells, it is possible to duplicate items in MCPE.
How it works:
You have to play in Multiplayer Mode and have some friends who help you. (Gamemode doesn't matter) Now all of the friends or other devices and youself open one chest. Now they put in the item they want to duplicate. (e. g. Diamonds) Now all devices click on the item and hold their finger on it to put it in their inventory in the same time. After the progress bar is full, all players should have a diamond now. (If all pressed on the item in the same time)
It's not really something game breaking, but still not right, because I think there are some people abusing it and playing unfair.

• Vulzu