Garuda (HARD) invisible primal

Did a search and could not find anything on it...

Had a group fighting Garuda (hard) the other day. We cleared her astral flow phase and as the tank, picked her up and started to tank her. She teleported to spawn her adds. When she did this, she became invisible and untargetable for me, the tank, which made things incredibly difficult. Luckily we were able to coordinate this issue and swapped roles with the OT. Upon her center phase after her adds, she reappeared.

Would just like to make this issue known because I can see many rage quits and wipes due to this bug.

EDIT: this happened three times that day.