Players Losing Curious Slot Relics when rejoining server.

[Rah-creator]

I'm currently running an ATM 10 as the base for my server, along with some additional mods. Occasionally, when players are booted from the server and rejoin, they lose the items in their Curios slots while retaining everything in their vanilla inventory.

I've been able to fix this issue by restoring their player data from a backups, but the problem keeps recurring. Interestingly, I haven't experienced this issue myself, but multiple other players on the server have been affected.

One of the Mods : https://www.curseforge.com/minecraft/mc-mods/cobblemon-box-link does add an extra slot to the Curios tab though i am unsure if this might play a part.

[TheIllusiveC4]

Hmm, are there any errors in the server logs when they are booted or rejoining? Also, what causes them to be booted to begin with?

[Rah-creator]

Last time it happened, there were no messages in the terminal or logs. However, I do recall that on one occasion, a java.net.SocketException: Connection reset error occurred. When the user relogged, their curious slots were empty. (Seems to only happen to the people that are on at the time of the disconnection)

[Rah-creator]

Update: Just Happened again to players on the server This is the error one of them sent to me :
Connection Lost
Internal Exception: io.netty.handler.codec.encoderexception:failed to encode packet'clientbound/minecraft:custom_payload'

[TheIllusiveC4]

It seems like the error is coming from a client-bound packet that is corrupted or invalid. Hmm, if that's the case, this is mostly just an educated guess, but I may already have something to address this in the next update.

[TheIllusiveC4]

Please test out the newest 9.2.3 version for 1.21.1 and see if the changes resolve your issue.