exploit duplicated items with beacon

https://www.youtube.com/watch?v=mbD7uOO0yVE this link exploit item, it really works just switch to pocket interface and have a beacon to do this. It's really unbalanced, this bug needs to be fixed 1.17.10, when in the interface of the beacon block I just need to repeatedly click on the item I need to duplicate to be able to do it, I'm not sure if 1.17.20 can do it or not. Hope to fix it as soon as possible