When "Allow Fullbody Tracking FBT" is turned off, the avatar does not start three point tracking properly.
This has occurred since the recent update. I discovered this on November 25, 2023.
When using FBT and turning off "Allow Fullbody Tracking FBT" or turning off the tracker, three point tracking does not start and the avatar's legs and feet stop moving.
I therefore have to restart VRChat when I stop using FBT, which is inconvenient.