In Lemuria, one dungeon is called Atrium, which has two fights of manders, followed by the flooding in of the poison gas, forcing you to use a secret exit.
When I join a Team Up for this dungeon (just to help out, not questing) and we finish the fights and I show them where to escape, I get penalized by the Team Up kiosk, as if I left too early or without helping the other wizards. Since it only takes a few minutes for me to help with this dungeon, I end up sitting around for five minutes waiting out the (totally undeserved!) penalty.
I have replicated this problem now, so it's not a one-off - if you do this Team Up, you automatically get penalized. I'll have to steer clear of the Atrium until this can be solved.