Cuachic Vault Boss Fight Never Starts

Zolin and Zelina just say words and never start boss encounter.
Reloading last checkpoint does not fix
Bouncing between checkpoints does not fix
Alt+F4 and relog does not fix

Had to go to waypoint and reset zone to fix

https://imgur.com/a/5drsZaT

same, had to run back entire zone.

sadness and sorrow

Same thing happened to me.

I don't know if this adds context or not but I managed to remove one of the two bosses from the fight and got killed after.

Bug Report ID: #250669522