I was dungeoning with two other people. We stepped on a party switch and the gate closed behind us.

As we were battling the newly spawned mobs, I was glitched out of the combat area and appeared on the other side of the newly closed gate. As it was a gate closed by a party switch, it was not going to open again, so I had to return to town in order to let the others advance.

I wish I had taken a screenshot, screenshots are my best friends.