Using Sophisticated Storage's Stack Upgrade and Supplementaries' Sack, you can duplicate any item you have more than a stack of (including unstackables).
Reproduction Steps
Put more than 1 full stack in a Sophisticated Backpack with a Stack Upgrade
Left click a Sack (to hold it)
Right click the overfull stack
The Sack will contain the full amount of the Backpack stack, but the Backpack will have only lost 1 stack
Describe the Bug
Using Sophisticated Storage's Stack Upgrade and Supplementaries' Sack, you can duplicate any item you have more than a stack of (including unstackables).
Reproduction Steps
Screenshots and Videos
Duplicating buckets of snow:
Duplicating emeralds:
Crash Report or Log
No response
Operating System
Windows 10
Minecraft Version
1.19.2
Modloader
Forge
Modpack Version
23.5
Other Mods