Did my first Atziri Run in Hardcore. During the run, you have to go to the Royal Chamber to see the interaction with Doryani and Alva where they open the chamber.
The chamber opened and I went in to kill Atziri. In her last phase she was down to 10% and she stood there doing nothing. (This is also a known bugged interaction)
However, the interaction never finished and I had to log to character selection to get to hideout.


Once I reset - the chamber removed the Royal Chamber from my temple maps.
But yet, even now, I cannot get into her chamber to kill her again.
Anything I can do?

Nope. Unfortunately, just rebuild and go again.