There was a mission last night that was bugged I got called in as backup , could not see where objective was(if there was any) , the timer ran to 0 and it said " Overtime teammate completing objective" tho neither me or my teammate were completing any objective after that the timer froze at 0 and the mission stayed going you could kill the enemy team until you quit the game( was 20 mins before I left game and time still frozen at 0)
Not sure if name of mission matters but it was Stage 3 of Mortargate and the mission was in Waterfront