[Bug]: Connecting a chain to an already existing chain has a 50/50 chance to crash the game

[Great-Void]

Checklist

• I am having issues with the Fabric version.
• I am using the latest version of Connectible Chains.
• I have looked for similar issues.

MC Version

1.20.1

What is the problem?

This happened on a server hosting the modpack "Homestead" by Tokimi, Cozy Studios

Problem description:
Connecting a chain to any 1 fence to another fence is fine. However when trying to connect a new chain to the previous fence's last interacted end-point (the 2nd time right clicking to complete the chain) it will crash the game instantly without a post-crash pop-up/error message

The server itself stays up, just a client crash. As long as the bugged not-yet-connected chain is loaded in or refuses to break off the player the client will crash again until it is gone.

Weirdly enough, after having crashed 2-4 times the chain will eventually disappear and have a chance to void the chain item you used and trying to place a chain on an already existing chain will magically just work without a crash.

Problem reproduction:
Without fail. Tested several types of fences, all had the same result.
Post-crashing 2-4 times, chains will magically work again as they should.

2026-01-07-7.log.gz

Relevant log output

[legoatoom]

Try updating the mod to v2.5.7 if you can.
I believe I fixed it there.

[legoatoom]

Warning

This issue has not received any update or comments for a while. It is stale will l close it soon.

[YumYumTuete]

I had the same problem. My world was rendered useless because it crashed instantly while joining.
I manually upgraded the Mod to 2.5.7 as mentioned by legoatoom and my world is loading fine again. Thanks for the fix.

[legoatoom]

Good to hear that! Sorry about the inconvenience.