This mod will re-enable you to invite players back into the game after an unfortunate disconnection (Point Of No Returns only). This should prevent those who disconnects through no fault of their own to rejoin and finish the heist without letting their hard work go to waste. Alternately, other players should also be able to rejoin your lobby without any problems.
It is unknown whether or not this will affect Overdrills, likely not. Will need to test.