Quitting the game right before the match started and rejoining the match did not teleport me to my base/onto the zip line.
I had a UI bug from my last match that I had to restart the game to remove (it remained there when I got into a new game, commented about it on a related post already), and...
Similar issue here, might be slightly different, I killed the enemy Billy right before I was returned to the hideout (during the victory "screen") and the killed icon wont go away in the hideout.