nekochanfood
The "Mouth & Jaw" value in the Tracking Control persists even if the avatar is changed.
If you change the "Mouth & Jaw" value to "Animation" on one avatar and switch to an avatar with other visemes, the "Mouth & Jaw" value will be retained and visemes will not work on the avatar you switched to.
How it occurs:
  1. Use
    avtr_bf6b05f2-44de-412c-9b2c-9ef0cfd20af6
  2. Open the avatar's debugging UI and check that "Mouth & Jaw" in Tracking Control is set to "Animation"
  3. Change the avatar to one with having visemes feature
  4. Unmute and speak something, You will realize that mouth is not moving
Video:
https://cdn.discordapp.com/attachments/1124037765181493320/1194585310844166174/visemes.mp4
Video (if the above link is unavailable):
https://i.imgur.com/Z27y9Yp.mp4