extra innings. texas tiebreaker situation. first team up doesn’t put runner on 2nd base. nobody, including umpires, notices. 2 runs score, no outs before it comes to the ump’s attention. what should the umps do?
Nothing. Play on.
And when the home team comes up, place a runner on second and be prepared to address with the visitor's head coach. And I would be doing that by saying that this isn't just my mistake - this is a shared mistake - the umpires are not the only one who should have noticed what should have happened and brought it up - coaches, players, scorekeepers, spectators....