Pressing Y (y) used to cancel the mission voting, whether it's counting down or awaiting all parties to tick. Pressing Y no longer does that nor offer a mean to speedily cancel a mission vote that counts down from 10s, or as short as 5 seconds if team is set to private.
This function is useful as we need to check whether everyone has the right relic for a premeditated run by hovering our mouse over the players' names. Having a finger on Y-key alleviates the issue for players that aren't good at osu/aimlabs/Kovaak's to rush their cursor over to the little 'X' button to cancel vote should someone select the incorrect relic.