The player model pose editor seems to be missing a language definition in the lang file for the body z rotation slider. I couldnt find a bug report channel (but maybe Discord is just hiding it) so I'm posting here.
I'm on NeoForge 1.21.1 with FancyMenu 3.8.1, Drippy Loading Screen 3.1.0 and Drippy Early Loading Module 3.1.0