Modpack Version

1.20.1 (issue since 1.19)

Describe your issue.

Instant crashes with "network protocol error" after opening Stock Network UI, no automation or cross-chunk storage is linked to the network.

Crash Report

https://gist.github.com/HongBo-contact/7808f0d5936a8332875fbb8ae9f86f11

Latest Log

https://gist.github.com/HongBo-contact/ec74ea90623db881627a3ec62fe86a09

Have you modified the modpack?

No

User Modifications

No response

Did the issue happen in singleplayer or on a server?

Singleplayer

Discord Username

hongbo

Shot in the dark:

What's the block around the side that is... transmitting? Is it triggering when you access the stock ticker?

If you can still reproduce the error and get the "Connection Lost - Network Protocol Error" screen, there should be what looks like a crash report but the file name starts with disconnect instead of crash and the first line reads ---- Minecraft Network Protocol Error Report ----. Can you please attach this file?

Is it normal to throw errors about class versions and Java17?

[24Apr2025 21:35:06.405] [pool-15-thread-1/DEBUG] [mixin/]: supplementaries-common.mixins.json:StrongholdCrossingSconceMixin from mod supplementaries: Class version 65 required is higher than the class version supported by the current version of Mixin (JAVA_17 supports class version 61)

(Presumably can't even start the pack with less than Java21, as that's required for MC 1.21.1, no?—So I guess I have something to learn here.)

those are errors caused by the wrong java version being used in the mixin json files. it is "normal"
example: https://github.com/MehVahdJukaar/Supplementaries/blob/9c1b8135534a05b8e0281cb63819368b2078d334/common/src/main/resources/supplementaries-common.mixins.json#L5

Additional notes: Seems to fix itself after a full launcher restart, feels like something akin to a memory leak?

does not appear to be a memory leak. you should have seen a popup when the crash occurred. that popup has instructions for support.

you should have seen a popup when the crash occurred. that popup has instructions for support.

It seems to be a singleplayer server crash, so no popup.

Additional notes: Seems to fix itself after a full launcher restart, feels like something akin to a memory leak?

update to that: 100% of the time full launcher restart fixes things, otherwise singleplayer crashes SERVERSIDE with

any chance you have the debug log as well?

From the most recent instance of this
https://gist.github.com/HongBo-contact/03b2c3d40bc4e4575814e365488ba0c2