This is what I received, when I ticketed this issue:
Thank you for contacting Blizzard Customer Support, here is Game Master [Name removed, for privacy.].
I understand that you have contacted us because you can not complete the quest.
Indeed there was a hotfix for the quests. But it might be bugged again.
As it is currently a known matter, could you please also report it as bug, to let our developers know that this is still happening to you.
You can either bug report it via Forum:
[Directions, including in-game, removed for brevity.]
Please keep in mind that this won’t create a ticket that you have access to. It will be directed to our developers and there won’t be an answer given directly.
I know that this might not be the answer you were looking for, but it is the only answer we are able to provide.
If you have any other questions or requests, please do not hesitate to contact us again.
May the luck be on your side!
In short, I still have the issue / the elite quests are still issues (quests, plural, as both remain bugged for me).
The quests are the 2 elite quests currently in the Caldera area:
- We Have Returned
- If You Can’t Take The Heat
I have completed all objectives but cannot complete or abandon the quests, without them coming back in the same way when I return to the area.
This is the second time these quests have, and this problem has, come up.