Backpack loader dupes items

[Boomer-1]

Description (Required)

Fluffy, just watch the video. it will explain exactly what I did and how easy it is.

Steps to reproduce the Issue (Required)

https://youtu.be/5oxCZ7o-rCw

Expected behavior (Required)

Server Log / Error Report

Environment (Required)

• Minecraft Version:
• CS-CoreLib Version:
• Slimefun Version: dev 987
• FluffyMachines Version: 94

[NCBPFluffyBear]

Determined to be a Slimefun issue after testing, issue will be recreated there.

[NCBPFluffyBear]

https://github.com/Slimefun/Slimefun4/issues/3379