I loved Chrono Trigger! The very first example of this that I ran into as a kid was Crystalis. You are told at the beginning that it’s Earth after an end of the world event, but it’s a sword and sorcery overhead action RPG (think original Legend of Zelda with slightly more RPG, slightly more action, and slightly more varied combat) and ends with you shooting advanced technology with your magic sword.
Chrono Trigger (and Chrono Cross for that matter) is a better game for sure but I played Crystalis as a kid when it first came out so it’ll always hold a special place in my heart. Chrono Trigger came out when I was about to become a teen so I had other things on my mind at the time.
As for Baldur’s Gate…kind of? Without going too far into it, most of the D&D worlds had some sort of apocalypse in their past. Faerûn’s apocalypse was so far back that they’ve completely rebuilt, and they were already fantasy so there was no serious genre shift (it’s high fantasy) and it doesn’t fall under the Earth All Along trope. The floating city that crashed when shit went wrong was held up by magic.
Ok, I went further into that than I meant to. I’m an old nerd.