There seems to be an issue with Map Editor, I don't know if its just on my side, but after a few minutes, the game automatically forces me to join a new Map Editor room. Which also happens to delete anything I had edited and starts me in a brand new fresh room.

I don't really have much context more than that, but it's useful to put it out there that Map Editor sometimes likes to reload itself and delete all your map progress.

This usually happens sometimes when the community platform is refreshing or fixing itself, where every room in a server simultaneously reloads; including Map Editor. If you were caught in it without saving your XML or a map code, tough luck.