OP here. I am more and more thinking it is a dead ball. Little League green book 4.10b "....play shall continue until .......(2) the home team scores the winning run in an uncompleted inning". Does this make it a dead ball?.
If it is a live ball, the defense can then go tag the celebrating players who were on base for additional outs before the appeal.
So I think the "game is over" on the winning run pending any appeal.