Duplication of items on versions 1.16-1.16.1 bedrock

This dup works only on the telephone version of minecraft. How to activate a dup.
1. You need a lighthouse
2. Put the lighthouse
3. Open the lighthouse and in 1-4 slots you should have 1 item that can be stacked up to 64 for example 1 diamond.
4. At high speed, click on this item many times and you will have 64 diamonds.
I ask you to fix this urgently.