A duplication bug using two backpacks.

Steps to reproduce the behavior:

1. have backpacks in two different slots (ie. slot one and two)
2. open bag one (right click) and switch to bag two at the same time. might take a couple trys. this will cause the ui of the first bag to be open while the second bag being the actual one selected.
3. throw out the first bag then take the contents out of its ui then you're able to pick the bag back up with the things still in it. This able to be thrown out because the game thinks you're on the second bag.

Expected behavior
To open the ui of the second bag. This was a bug with mekanism personal chests in 1.12 so i figured id try on this in 1.15.

Screenshots
If applicable, add screenshots to help explain your problem.

Versions

• Mod version: 1.15.2-1.9.4.63
• Minecraft version: 1.15.2
• Forge version: forge-31.1.25
• UTeamCore version: 1.15.2-2.11.0.156

Log (if crash occures)
Link to crash log