I submitted a ticket for the incident, and the responding GM encouraged me to submit a bug report on the official forums, so here I am!

Today in Crystal Tower at 2:30PM (mountain time), a tank by the name of Yoda Skywalker joined an in-progress run and went AFK as soon as he entered. We were unable to kick this player. Any attempt to do so brought up an error. I can't recall exactly what it said, but the gist of it was, "You cannot initiate a kick when a vote is already in progress."

None of the party had initiated a vote, which leads me to believe that this player initiated a vote kick against another player, but didn't submit it. If I'm right, this prevented the player from being kicked themselves, as a vote was technically "in progress". It's an untested theory, admittedly. If true, though, it's a very simple exploit which could allow a large number of players to acquire myth, philo, and CT items without putting forth the requisite effort to obtain them through legitimate means.