Aux pivots not working as expected


I created a few aux pivots on a character’s feet, when I’m selecting one of it a gizmo moves to its center, but transformations work as if I’d use a regular controller. However, in case I set the IK key on the aux pivot and copy/paste a next or previous keyframe position it snaps to the proper place. AFAIR it worked in some earlier versions of MB, but since a few years ago it behaves this way.
Is somebody else here experience the same problem? I found nothing on google.