On Friday afternoon, the Heir to the Shattya Dynasty and I had the following shaila. Perhaps we even did it on purpose to have such a good shaila.
We forgot to say yaaleh v'yavoh during mincha, then we davened maariv for early shabbos and it was still day. Then we went and asked the rosh kollel whether we should daven over, and should we say a minch or a maariv, and should it be a weekday one or a shabbos one, and should we say yaaleh v'yavoh or v'sein tal umattar.
If anyone can answer this shaila with a compelling source, I will dedicate to them a troll thread.