Beacon Duplication Glitch

This may have been reported before, since it seems to be old and maybe private.

There is an exploit where any stackable item can be duplicated using a beacon. Open the inventory by clicking on the beacon, then using the first 9 inventory slots tap repeatedly on the item that is to be duplicated.

As far as I am aware this only works with the pocket UI, does not work with non-stackables, and does not work in the other inventory slots. Hopefully this is a sufficient explanation and I hope this is fixed soon for the sake of our SMP server. Thanks