Call the OnTermination(ActionFSMBaseStopEventTState, TData) hook if you want to retain this behavior. When overriding make sure to call base.PostStop(); Please note that this method is called by default from PreRestart(Exception, Object) so override that one if OnTermination(ActionFSMBaseStopEventTState, TData) shall not be called during restart.

protected override void PostStop()

abstract PostStop : unit -> unit 
override PostStop : unit -> unit