This happens when the height from feet to floor is a little off, needs some tweaking inside the BIK component settings. However, in 4.12 version i’ve tested sometimes this even happened after adjustments, for instance when sliding around a rock, or wall, and there is a steep height. This behavior suggests that the tick, or amount of traces could be lowered, maybe, though unclear how feasible this approach would be.
Does your model uses APEX clothing, because of the root mesh interference? There is a solution if true.