0. ALWAYS PROVIDE INFORMATION ABOUT MODLOADER (Fabric / Forge) AND MOD VERSION (For Example 1.19.2-8.2.10)
   Fabric Loader 1.20.4, Mod version: 1.20.4-9.4.0

1. Describe the bug
   After updating the backpack mod to latest version (9.4.0) all the stuff inside the backback got deleted entirely, even the water reserves got deleted

2. Write steps to reproduce the bug
   1- Use an older version of the mod and put stuff in it (possibly also in the craft bar)
   2- Update the mod to latest version and restart the world

3. What is expected behaviour
   Stuff must not disappear along with the reserves (it seems that sometimes it also reset the tier, but not sure)
   It seems it happened after the devs removed the crafting bar alone feature (like it's not inside the backpack directly, don't know how to explain it clearly, but i had two items in it before updating i think, maybe that's what at least partially caused the issue)

4. Screenshots (If applicable)
   

I'm actually really pissed off cuz i had a LOT of stuff in it, it was litteraly full, i have a backup of the world but it's one week old...

EDIT: Just realized that it may be my fault, without paying attention to it i downgraded the mod version instead of updating it, the mod menu mod messed it up with the update notification and like a clown i didn't checked it, it showed me 9.4.0 instead of 9.4.3, sorry for the bother