Possible Fixes

Yes

Modpack Version

All the Mods 10-1.26-(Release)

What happened?

• Private server hosted on a local machine, when connecting after updating from 1.25 to 1.26, successful connection.
• Both client and server are running 1.26
• When auto sugarcane farm activates pistons, disconnect from the server with Packet handling error.
• Downgraded back to 1.25 on server and client, no disconnect when pistons activate.
• When looking at server logs, player is just disconnected from server.
• If you can unload the chunks, no disconnect

Please see attached log

latest.log

https://gist.github.com/liham10/2a544ebac8b621f0872918499d479b2a

Developer reports

https://gist.github.com/liham10/1ff601bdf5240bc6d887c94d8f4a18d4

Update:

• Updated to 1.27 from 1.25, same issue encountered.
• Uninstalled pack and did fresh install, produced same result
• downgraded back to 1.25 no issue
  disconnect-2024-12-06_20.02.39-client.txt

I have the same problem. As a temporary solution, it helped me to remove each piston.

The current solution is to disable the recently introduced piston protection feature in ftbchunks-world.snbt. It will be in the serverconfig folder

• 1.27 server disabled in config, tested ok.
• updated to 2.0 and left as default, disconnect no longer occuring