Tested with

• Minecraft 1.20.1
• Forge 47.1.47

The following mods were used:

• Create 0.5.1.d
• Create Mechanical Extruder 1.5.4.d-9

To recreate the issue, you have to start two instances of Minecraft.
On instance 1 you create a new world and open it to lan, and on instance 2 you join the server.

Client receives this error message on the screen after trying to join

Debug log from host: https://paste.essential.gg/eeJ95H1Wns
Debug log from client: https://paste.essential.gg/9zYhThgmkM

Thanks for the report and the data provided.