After updating my mods and neoforge to version 21.0.80 i can´t enter my "singleplayer" world anymore.
It crashes with "connection Lost - Network Protocol Error"

My debug file looks like this.
https://pastebin.com/1nshyxiz

If the crash is related to something else that i am not aware of, please be so kind to point me at it as i am not a pro in reading those files.
Thank you

It should've been fixed in #539, closing.