Is there an existing issue for this?

• I have searched the existing issues.

Are you using the latest Structurize Version?

• I am running the latest beta/release version of Structurize for my Minecraft version.
  I am also running the latest versions of other mods that are part of my problem.

Did you check on the Wiki? or ask on Discord?

• I checked the MineColonies/Structurize Wiki or I asked on discord.

Minecraft Version

1.21

Structurize Version

structurize-1.0.754-1.21.1-snapshot

MineColonies Version (if related bug)

minecolonies-1.1.773-1.21.1-snapshot

Related Mods and their Versions

--fml.neoForgeVersion, 21.1.62, --fml.fmlVersion, 4.0.24, --fml.mcVersion, 1.21.1, --fml.neoFormVersion, 20240808.144430

netty-0.1.4.jar [parent: owo-lib-neoforge-0.12.15-beta.9+1.21.jar...
fabric-networking-api-v1-4.2.2+a92978fd19.jar" [parent: owo-lib-neoforge...

EDIT: I have removed Accessories, and owo because it seemed to bring some networking related libraries and the above listed jars disappeared. The issue persisted though.

Current Behavior

Others cannot join the server as long as structurize is part of the modlist, removing the mod solves the issue.
Whereas I myself have no issues joining, but the server is on my clients premise.

I have added the Connectivity mod AFTER encountering this issue in order to perhaps get more information about it, but it was not very useful and has not changed the outcome.

I have also taken the pack that I share, installed it back for myself, ran it and joined and it again worked for me, making sure everything is identical.

Expected Behavior

Any client could join without issue

Reproduction Steps

Unfortunately nothing spectacular.

1. Put the given mods together
2. Add the server redacted
3. Try to join and then encounter "Failed to encode packet 'clientbound/minecraft:custom_payload'"

Logs

https://gist.github.com/5cript/5148313f9f032b58955c8a6de3ba5799

Anything else?

Link to a modrinth mrpack file useable with the modrinth launcher: http://nuicpp.org:8081/Onwards%201.2.0.mrpack

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The true error seems to be java.lang.NoSuchMethodException: net.minecraft.network.protocol.common.ClientboundCustomPayloadPacket.packetName() at https://gist.github.com/5cript/5148313f9f032b58955c8a6de3ba5799#file-gistfile1-txt-L3293
This usually means coremodding/mixins/corrupted forge jar, tho entire stacktrace is weird
Try removing [email protected]/com.connectivity.logging.PacketLogging.logPacket

Remove all your fabric mods, I've seen one called fabric networking api. We don't support using the forgified fabric api anyway.