Overpowered Duping glitch in Minecraft bedrock

This glitch is proformed by going into the nether with a stack and one item of the item you wish to dupe and also have the rest of your inventory filled with other items. Then you throw the on singular item on the floor and fill the slot that used to have the one item with a different item. After proforming that and standing above the item and clicking you stack of items in your inventory then quickly closing the inventory, you leave and rejoin. Once you have rejoined the item on the ground will be gone and if you open your inventory there will be a extra stack of that item in your select crosshair.

Here is a link with the video I found this bug, I have proformed this duping bug to see if it truly works and it does...

The bug I am talking about is at 4 minutes and 40 seconds: https://youtu.be/9cyr-TUDmoI?t=282&si=Q21WGXTmVfx9eExT