WorldEdit on Fabric Server causes players to not connect with Java error (packet larger then expected)

[alotod]

WorldEdit on Fabric Server causes players to not connect with Java error (packet larger then expected)

[me4502]

I can't reproduce this issue, is there anything else about your setup that you haven't mentioned?

[dougclow]

I have a similar issue on Singleplayer - I can connect fine and most things seem to work fine (selecting with the axe, //replace, movement commands) but if I do //sel I get disconnected with:
Internal Exception: io.netty.handler.codec.DecoderException: java.io.IOException: Packet play/clientbound/minecraft:custom_payload (class_2658) was larger than I expected, found 8 bytes extra whilst reading packet clientbound/minecraft:custom_payload

(Fabric but no other mods, native not Docker.)

[dougclow]

I've done some more systematic testing and tried pretty much every command in the docs apart from schematic, snapshot, and scripting commands, and everything works fine except for:

• //sel - with and without arguments, except //sel list works and shows the list of options
• //deselect
• //pos (with and without arguments)
• //chunk (with and without arguments)

all of which disconnect me from the game with the same error.

I've not been able to test //curve because I can't get a convex polyhedral selection, because I can't use //sel, but all the other region commands, including //line, //set and //replace, work fine.

Minecraft 1.20.6 with Fabric Loader 0.15.10, Worldedit 7.3.1+6763-2e55f4f. Crash log on a minimal setup for reference.

[aurorasmiles]

I've been able to replicate this as described by @dougclow
Using Fabric Loader 0.15.11 on 1.20.6 with WorldEdit 7.3.1, fresh install without any other mods.
Some commands work fine, but //sel for example instantly disconnects me with a similar error

Edit: Funnily enough, //drawsel and then //sel works perfectls fine.
It also throws me into the Multiplayer screen after disconnecting, even if I was in a singleplayer world

[aurorasmiles]

Not sure if it helps, but with additional debugging logs:
https://paste.enginehub.org/IbzRoo9U1

[WithLithum]

Not sure but it probably has something to do with CUI packets