Ok, so according to the rule 4.09: A run is not scored if the runner advances to home base during a play in which the third out is made (1) by the batter-runner before he touches first base; (2) by any runner being forced out; or (3) by a preceding runner who is declared out because he failed to touch one of the bases"
now, from my understanding if there is a runner on 3rd and a runner on 2nd and fly ball to outfield....both runners tag up, runner is safe at home.....defense appeals guy on 2nd left early and win appeal.....runner who left 2nd is ruled out but run that scored is allowed due to appeal out is considered a timing out......this seems fair, but if he was a runner on first, tagged up legally, ran to second and overstepped second and somehow made it all the way to 3rd....defense could then appeal he overstepped 2nd and win the appeal.....then the runner who tagged up legally from 3rd would not be allowed according to about exception to rule 4.09......this does not seem fair. How come a tag up appeal allows a run to score, but a over run base causes score to be disallowed. they both seem like appeal plays. I get the force out appeal one at first....but not the one where runner oversteps a non-force base. if I'm wrong about the tag up appeal let me know, or clarify I'm right please.