Item duplication glitch

[pjindras]

Information

Environment information

11:22:33[INFO] Minepacks: 2.4.27-T20240129235629
11:22:33[INFO] Server: git-Purpur-2152 (MC: 1.20.4)
11:22:33[INFO] Java: 17.0.10
11:22:33[INFO] ##### End Minepacks version info #####

Online mode: NO

BungeeCord: NO

Server/crash log

<!-- Replace this with your crash log / link to your log file -->

Plugin config (optional)

(https://paste.gg/p/anonymous/3797dc4a6ef74fcba80bcb4b01a387b2)

Details

Description
If the server is slower to shut down and the player opens the backpack at the last moment, after restarting the server he has items both in the inventory and in the backpack too, so the items are duplicated.
It would be very nice, if it was possible to prevent this somehow, because players are abusing this.
Thank you!