Describe the bug
Crash when Shift + Click on item in backpack inventory
Crash log: https://mclo.gs/LQetUR6

To Reproduce
Steps to reproduce the behavior:

1. Open backpack
2. Click on item in backpack with Shift + L. Click
3. Game crash

Expected behavior
No crashes

Versions
sophisticatedbackpacks-1.19.2-3.20.2
sophisticatedcore-1.19.2-0.6.4.605

Just don't use smoothswapping. it's been this buggy for a very long time or report this bug to them so they finally fix