Forge: 1.19.2-43.2.8, 1.19.2-43.2.23
Mod Version: 1.19.2-1.5.3.c-36, 1.19.2-1.5.4.c-36
Create Version: 0.5.1.c
Other mods: None

https://github.com/oierbravo/createsifter may also be affected as it had similar changes since its last version. I have not yet tested it. - Create Sifting 1.19.2-1.7.5.c-36 is OK

When joining a server the client is disconnected and given the on-screen error:

Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NullPointerException: Cannot write a null registry entry!

The previous version 1.19.2-1.5.2.c-36 does not have this problem.

Server Debug log: https://gist.github.com/TigerWalts/94aa5e504868721acccbbdfc025bdae4
Client Debug log: https://gist.github.com/TigerWalts/6573781d6a7e95fd500820d53e45ef8c

The error happens after the loading screen disappears. The game may render for a few frames before the error screen appears.

Tested with 1.19.2-1.5.4.c-36 in case it was the same cause. No luck.

Thanks for the report!
I'm looking into it.

Thanks too for the logs & all the data! It helps a lot!

Uploaded a new version with the fix.