Operation Mechagon Hard-Mode broken?

Trying to do solo hard-mode for the mount. After killing first 2 bosses with aerial unit above them (King Gobb & Gunker), aerial unit isn’t positioning above the 3rd boss. It just circles above the path leading to the 4th boss.
Anyone knows if this is a bug or maybe I’m doing something wrong?
Dungeon difficulty is set to Heroic.
Thx

Correct me if I’m wrong, but isn’t Hard Mode only activated in Mythic?

My bad. Just doing it on Mythic and it works :slight_smile:
P.S. got the mount on my first try :+1: