Hey,
Unfortunately VRChat's last physbone update broke chest sliders/physbones of my avatars using Fuzzy Base V2 (All small furries: Murto, Väre, Kielo, Hile and Raita)
Quick fix to prevent the chest getting stuck is to remove the "Root Transformation" from Boob bones (Setup should be about the same for all the furries)! It has been set to "Boob_Root" now but it should be empty.
I will update packages as soon as I have time! Please let me know if the update broke anything else!
If you need help please join to my server: https://discord.gg/A3EEE4ZpPb
Sincerely
Sohvi