appellate court concept with gavel. 3D rendering

As we have noted in another post, Non-Final Finality: Does One Interlocutory Issue Resolved in a Bankruptcy Court Order Render All Issues Addressed in the Order Non-Appealable?, not all orders in bankruptcy cases are immediately appealable as a matter of right.  Only those orders deemed sufficiently “final” may be appealed without additional court authorization.  See 28 U.S.C. § 158(a)(3) (interlocutory order may be appealed only with leave of the court).  Appeals from “final” bankruptcy-court orders usually are first heard by a United States district court or a bankruptcy appellate panel (a “BAP”), which have jurisdiction “to hear appeals from final judgments, orders, and decrees” from bankruptcy courts.  Id. § 158(a)(1).

What happens when a district court or a BAP properly exercises appellate jurisdiction over a bankruptcy court’s order,