[BUG] Item duplicate + Error (Paper 1.16.5)

[DxrkCat]

Describe the bug
When 1 diamond block is broken, 5 diamond blocks are raised. And this error in the console

To Reproduce
Steps to reproduce the behavior:
When 1 diamond block is broken, 5 diamond blocks are raised. And this error in the console

Expected behavior
When 1 diamond block is broken, 5 diamond blocks are raised. And this error in the console
https://paste.laravel.io/a873a20d-dd3e-46a7-b673-aa584cea2c8a

Screenshots
https://paste.laravel.io/a873a20d-dd3e-46a7-b673-aa584cea2c8a

Info (please complete the following information):

• Server version: (example: paper 1.15.2) paper 1.16.5
• Client version: (example: fabric 1.15.2) vanilla 1.16.5 (no mods)
• Plugin version: (example: 2.0.9 do not write "latest") 1.1.8

Additional context
Add any other context about the problem here.

[DxrkCat]

LoneDev?

[DxrkCat]

can you fix it pls? @LoneDev6