Tried so far:
  • Removed custom armature
  • Removed custom meshes
  • Removed Protection system & Custom Animator layers
Removing GogoLoco suddenly made it work again.
Reproduction steps:
  1. Equip the avatar with the id 'avtr_bb571594-6e27-4ea3-8312-11efa7e30a9b'. (use prismic's avatar world to grab the avatar by id directly)
  2. Try to scale
  3. It doesn't scale properly, and you are always forced to 0.31m (sometimes only your mirror copy, sometimes both the real you and the mirror copy)
Additionally I have removed GogoLoco from my main avatar, to confirm that there is not anything else at play here.
Tested on 1373 and 1371