Using Sophisticated Storage's Stack Upgrade and Supplementaries' Sack (right-click-to-add functionality), 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
Screenshots and Videos
Before reproduction steps:
After reproduction steps:
Minimal mod list to reproduce issue
Supplementaries
Sophisticated Backpacks
Quark
Additional Info
Quark Shulker Boxes also have this right-click-to-add functionality, but they don't have the issue (they correctly subtract the amount taken from the Backpack's storage).
Before Continuing:
Version
1.19.2-FORGE
Supplementaries Version
supplementaries-1.19.2-2.4.20
Moonlight Lib Version
moonlight-1.19.2-2.3.6-forge
Issue Detail
Originally discovered here.
Describe the Bug
Using Sophisticated Storage's Stack Upgrade and Supplementaries' Sack (right-click-to-add functionality), you can duplicate any item you have more than a stack of (including unstackables).
Reproduction Steps
Screenshots and Videos
Before reproduction steps:
After reproduction steps:
Minimal mod list to reproduce issue
Additional Info
Quark Shulker Boxes also have this right-click-to-add functionality, but they don't have the issue (they correctly subtract the amount taken from the Backpack's storage).