Upon the entry of a final order by the court establishing a guardianship pursuant to NRS 432B.4665:
1. The custody of the child by the agency which has legal custody of the child is terminated;
2. The proceedings concerning the child conducted pursuant to NRS 432B.410 to 432B.590, inclusive, terminate; and
3. Unless subsequently ordered by the court to assist the court, the following agencies and persons are excused from any responsibility to participate in the guardianship case:
(a) The agency which has legal custody of the child;
(b) Any counsel or guardian ad litem appointed by the court to assist in the proceedings conducted pursuant to NRS 432B.410 to 432B.590, inclusive; and
(c) Any person nominated or appointed as the person who is legally responsible for the psychiatric care of the child pursuant to NRS 432B.4684 or 432B.4685, respectively.