A Bug when changing verisons + joining a server in that version

[nicolastestingthings]

General Information

https://dump.viaversion.com/9226ef14c5119ea4df107ef8952f441368ff8ff5c8a4e8cefb84a19cc07a1bd7

Bug Description

when i chage the version and join a server it gives an error

Steps to Reproduce

(26.1.1)

1. Change version to 1.21.10
2. Join a server
3. The error appears

Expected Behavior

i should be able to join the server, but instead it gives an error

[Barvalg]