Duping items with Beacon

Maybe you know already this bug, but I need this fixed as soon as possible. In mobile devices, you can dupe stackable items using a beacon.
Steps to reprofuce:
1. Put a beacon.
2. Set UI Profile in Pocket.
3. Put any stackable item in the inventory slot (it works only for upper inventory slots)
4. Open beacon UI and touch repeatedly in the stackable item.
5. The item will dupe.
I hope you can fix it as soon as you can.