Kevin Henderson, the second base umpire, knew the rule and immediately made the proper call.
5.09-- The ball becomes dead and runners advance one base, or return to their bases without liability to be put out when --
(g) a pitched ball lodges in the catcher’s or umpire’s mask or paraphernalia; runners advance.
MLB adds the clause "And remains out of play" before the semi-colon -- and that was what ABC put on the screen for the proper rule. In Little League rules, there is no judgment about the ball remaining out of play. Because of the time it took to find the ball (the pitcher had to tell the catcher that the ball was sticking out of his chest protector), I say that is the right call either rules set.