Blender 3.6 might break older models (weird lips bug) (Patreon)
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It may or may not happen to you, it seems random as fuck from my tests.
I'm pretty sure it's because of the new feature allowing to register multiple scripts folders, it must be bugged somehow so the script that fixes the lips on startup sometimes won't work on fresh installation.
I seem to have fixed it but I can't really tell how. I just moved the startup folder from C:\Users\yourusername\AppData\Roaming\Blender Foundation\Blender\3.6\scripts to the desktop and vice versa until at some point it worked again.
...go figure ¯\_(ツ)_/¯
Once it's fixed, it seems to hold up so there's that at least.
If someone finds a more reliable fix than brute force and luck, leave it in the comments and I'll edit the post.