Information
Environment information
Plugin + server version info: MinePacks 2.3.21 - Release Paper 253 MC: 1.16.3 - Java 8

Online mode: no

BungeeCord: not enabled

Details

Description
Duping backpack item with fox

Steps to reproduce
If you shift click with the backpack on a fox, you leave from the server and you rejoin, and you trade with the fox you'll have 2 backpacks

Expected behavior
Not getting dupe (User should not have permission to do it)