by Gael de Sailly » Fri Mar 17, 2017 22:36
Moontest might have disabled the engine's map generator to replace it by its own generator, and once you disabled it there were simply no map generator. To fix it, go to the world's directory, and open "map_meta.txt". You should find a line with "mg_name = singlenode" (if that's not singlenode, then i'm wrong…), replace "singlenode" by the map generator you used previously (v5, v6… I don't know), and save the file.
So unexplored places will generate again, but there will remain holes. Go in a hole and type "/deleteblocks here" and it will remove the air and then generate the land again.
I hope this will help you.
Very busy this year too, so do not expect me to be very active on the forum or in game. But I'm not about to drop Minetest forever :)