This bug still exists, years later. I'm running the most current version of the game as of this time, Definitive Edition.
After I got the "Final Maneuver" quest, Nungata disappeared so that I can't turn in my current bounty quest with her. Based off of others' reports, it doesn't matter which of her bounty quests you have; I happened to have the Uamoro bounty ready for turn in. Also doesn't look like they are going to fix this since it's existed for a couple of years.
Crossing my fingers that Nungata returns to normal after I finish the Final Maneuver quest.