This bug should have been present in all platform versions of Bedrock 1.16

How is it triggered?

Set the UI to Pocket -> Click on the beacon -> Click repeatedly on the item to be copied

Trigger limit:

The number of items that need to be copied is 1, 2, 4, 8, 16 or 32.

I hope this bug is fixed soon, because it can have a very bad effect on some of the survival servers in the bedrock version!