I noticed this recently with a friend. When they didn't have their FBT on they would walk or run and only their legs would move, with their torso, hands and head completely still like its always been, but when they put on FBT and turned on FBT Locomotion their head chest and hips would be bouncing , but their hands would stay completely still.

I've seen the same effect on pretty much any avatar, I just don't know why? I don't like using FBT locomotion because of the bouncing, but Id like to have my legs move when I move. Is there a way to fix this? Add a toggle that locks your spine and that from the Locomotion animation but lets your legs move?

I'm unsure if this is a bug because it could be intentional or something that slipped through the gaps.