Hagara and her trash being bugged, then she despawned

Progression in DS
We reached hagara and wiped on trash, then all the trash spawns at once except the miniboss, kill two waves out of 4, boss and miniboss spawns together.
We pull Hagara and reset her between each remaining trash wave.
Then she simply stops respawning.
This is the second reset, how is this acceptable on the official servers?

First time playing wow?

Bugs happen. Deal with it.