Warping at MPQ

Description of the bug: I was doing MPQ with ppl and one of them missclicked to Juliete before the last fight and left the PQ instead of going far right and entering a door. We proceed to kill the boss and when we were done and got warped to the next room, this person got warped back with us, while she was at FM.
What is supposed to happen?: Keep the person outside
Where did you find and/or notice this bug?: Magatia PQ today
A step-by-step guide to re-producing this bug : leave the PQ and make a party to win the PQ i guess
Extra information (optional): i forgot to take SS of before and after because it was unexpected tbh. I think she wasnt able to retrieve any rewards, but im not sure, i crashed right after on both clients suddenly (only 1 client was doing MPQ)