In previous builds, I could change folding direction of the knees and elbows by specifying the IK Pose layer.
Avatars with and without the IK Pose layer behave the same in current build. It has no effect.
I'm using the IK Pose Layer from https://xiphia.booth.pm/items/2783859.
This IK Pose controller makes the knee folding direction slightly inward (in FBT).
However, in current build, it does not seem to work.