First DropWhen playing team games, there is a bug where if one player remains in the previous match looking at stats, they get booted when the group leader goes search for another quick match game.
Auto-addThe player in the stats screen is able to somehow auto-rejoin the group automatically (w/o an invite). The game loads as you would expect (with all players).
Auto-Drop As soon as the game starts, the teammate immediately surrenders and is kicked out of the game.