Before Continuing:

• Check you are using the latest version of the mods and its dependencies
• Always include a latest.log if you are crashing
• Remove mod that enhances Minecraft: Optifine, Sodium, others. The issue persists.
• If you are unsure which mod is the culprit.
  Disable all of your mods and enable them 1-2 mods each time to isolate the culprit
• Confirm that there is no existing issue with a similar description submitted in the list of issues.

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

1. Put more than 1 full stack in a Sophisticated Backpack with a Stack Upgrade
2. Left click a Sack (to hold it)
3. Right click the overfull stack
4. 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

1. Supplementaries
2. Sophisticated Backpacks
3. 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).

This should not be an issue in later versions