The head disappears sometimes after exiting first person view and it stays missing unless you sprint.

Steps to reproduce the behavior:

1. go into first person
2. exit first person, good chance that this triggers it.
3. head is gone

The head should stay in third person upon exiting first person

if there is an incompatibility i do not know about in this modpack im using please let me know
13 BETA RPG FABRIC 1.20 STABLE V13-13.zip

Which version are you using?
I think this is fixed in 2.1.0-beta.3