0. ALWAYS PROVIDE INFORMATION ABOUT MODLOADER (Fabric / Forge) AND MOD VERSION (For Example 1.19.2-8.2.10) - travelersbackpack-fabric-1.21.7-10.7.0.jar

1. Describe the bug
   Occasionally, shift-clicking or using the quick-move arrow button to move items to the backpack will delete items if the backpack is full. No void upgrade on the backpack either. Currently on a diamond level backpack, unsure if it happens with other levels. Exiting game and reloading from the launcher usually fixes it

2. Write steps to reproduce the bug
   Happens fairly consistently, though seemingly random

3. What is expected behaviour
   I would expect the items that the backpack has no room for to not move and stay in the hotbar or player inventory not be deleted.

Please try to remember the steps to reproduce the issue when it happens, also try making a screenshot of backpack contents when you experience it

__can i contribute to it