Siren boss fight bug

Bug Report ID: #1474285475

I entered the Singing Caverns boss arena to fight the siren. I took a screenshot (to send to a friend), then threw a few fireballs. The boss dove into the water, and never came back up. I ran around the arena multiple times, and she never returned.

Exiting to character selection did not fix it.
Relaunching the POE2 client did not fix it.
I tried to join a party to teleport out and it said portals are disabled in a boss fight.
I can not use portals to get out.
I closed the client for a few minutes, and it's still bugged.

Currently leaving client closed for 10+ minutes to see if instance resets.

It does reset but you lose your map sadly.

It just happened to me, so frustrating. It should have a way to leave the boss arena even if it counted as a death (at least for standard).

Same just happened to me. How did you get out?