Just tried in 4.8.1 third person to be extra sure and if I take same setup but take box collider and turn “auto weld” off then they work as intended. Otherwise. Same “issue”.
In my opinion sometihngs not right. They are still parented, but autoweld causes overlap events on any movement to fire both enter and exit… trying first person 4.8.1 now and then im done with it for now.