When calibrating a second time some avatars will have the feet pointing straight down while in T pose. Calibrating like this results in the feet being stuck pointing down in full body. Seems to be mostly on booth avatars, maybe if they have toe bones mapped?
It’s caused by calibrating with animations off, but turning them on and disabling full body doesn’t seem to work. Others with the same bug were able to switch avatars and it was ok , others I talked to had the issue briefly and then never again. Due to lack of ik settings calibrating in a different avatar and switching doesn’t work well for me as you have to be careful how you align yourself during calibration to get somewhat decent tracking. Any workaround I found was more work than restarting the game. Happens on the beta only.