Timing
My Jetpack flew away forever. u.u
The deathtimer was set a long time ago though in update notes, but I admit; I actually assumed it’d be gone during Tuesday’s update till someone told me few days ago.
I am sorry you missed out. ArenaNet did post a schedule beforehand.
‘The Molten Facility dungeon will be available until Sunday, May 12 at 12:00pm Pacific, when the entire Flame and Frost saga will progress to an epilogue.’
https://www.guildwars2.com/en/news/a-guide-to-flame-frost-retribution/
They specifically stated when the dungeon was closing on April 30th, the day the patch released.
“This achievement can only be earned during the epilogue, which starts on Sunday, May 12 at 12:00pm Pacific and remains active until Thursday, May 16 at 12:00am Pacific. You can earn this achievement by interacting with a bonfire in either Lion’s Arch, Hoelbrak, or the Black Citadel.”
Tyr Sylvison – Warrior
Illyiah – Revenant
I believe that is a different achievement than what the OP refers to, and it is only available until May 14th. (A mistake in the post on ANet’s part.) =)
Past experience has actually led me to believe that they always / somewhat consistently put up -new- content at Noon server time, NOT at 5PM daily reset.