Since the latest patch update, jaw flap no longer works and is noticeable on other users wearing the avatars. Use to be a client side issue locally, but is now noticable on others.
Avatar IDs that are affected (placed 2 as there is 2 versions of the rig. 1st one doesnt have finger bones setup and 2nd has finger bones setup):
avtr_d777a9f2-d542-4573-af09-fb2a4b7325ce
avtr_d8b1c165-9004-41b9-9b1f-f98adc4ad245