Observed behaviour

Upgraded ATM10 server to 0.33 today. Made a Sophisticated backpack, put it in curio back slot. After 1 or 2 openings, the client crashes. If I remove backpack from curios slot it works fine. If I remove all iron rings and necklace from curios backpack works fine from curios slot.

Client disconnected with reason: Failed to open a screen with advanced data: java.lang.ClassCastException: class io.redspace.ironsspellbooks.item.curios.CurioBaseItem cannot be cast to class net.p3pp3rf1y.sophisticatedbackpacks.backpack.BackpackItem (io.redspace.ironsspellbooks.item.curios.CurioBaseItem is in module [email protected] of loader 'TRANSFORMER' @3be3e76c; net.p3pp3rf1y.sophisticatedbackpacks.backpack.BackpackItem is in module [email protected] of loader 'TRANSFORMER' @3be3e76c)

Expected behaviour

I can open backpack without crashing

Steps to reproduce

ATM10 0.33 server

1. Have iron poison and fire ring, and a necklace in curios.
2. Put sophisticated netherite backpack in curios.
3. open backpack with hotkey, crash

Server Type

Dedicated Server

Crashlog

https://mclo.gs/Apdosfv

Iron's Spells N Spellbooks version

1.21-3.4.4

Forge version

Neoforge 21.1.8

Other mods

ATM10 - 0.33, no manually added mods

https://www.curseforge.com/minecraft/modpacks/all-the-mods-10/relations/dependencies

This is an issue with sophisticated backpacks and should be reported to them. there is nothing i can do on my end