Duplication bug for mobile devices

On a mobile device if you set your UI Profile to Classic and open a beacon any stackable item that double tap in your first 9 inventory will double.

 

step 1. Open Minecraft on a mobile device

step 2. Go to video settings and set UI Profile to Classic

step. 3 Open the GUI of a Beacon

step 4. Double tap any stackable item in your first 9 inventory slots