Yes, maybe the storklets do not die because of this kind of treatment. I've also seen it often, when the storklets are some days and weeks older. But how awful is it for a storklet, when it just has come out of its shell!? It is surely totally exhausted and then this.
It may be so as it is, but it goes over my horizon, why the parents can not avoid this. Maybe it's a problem of their long legs and balance. Sara nearly stumbled through the nest.