whenever trying to put something on your back while on multiplayer, as soon as you attempt to put an item on your back (sword in the sword slot) you will be instantly kicked and given the reason "Packet Processing Error"

I can confirm that it works in single player.

I have the 1.18 versions of backslot, backslotaddon, fabric api and cloth installed on the server and client.

hey desarko,
tried to recreate this bug but for some reason I don't get this error.
Do you have java 17, latest backslot and addon, fabric api and cloth config api installed?

Hi,
I can confirm that I have all those things. to help narrow down things i've removed the addon for now.

I feel I should note that this is running off a dedicated host, which has paper and bukkit installed on it by default. And this problem can only be created by manually placing the item in the inventory slot, nothing happens if I try to use the keybind.

I also get an error code:

Error whilst processing packet net.minecraft.network.protocol.game.PacketPlayInWindowClick@29240d6a for Desarkro

Hi, i've been messing around with this problem a bit more and it seems to be a problem with trinkets rather than backslot. I just didn't notice as I always tried to place an item on the trinket slot so assumed it had something to do with this mod.

You can change the slot positions in the inventory with the config :)

This should be fixed in a later version.