Hey, so I was working on maps and adding on to tilesets and then when I went to run the game it said there was an error loading overworld.dat. When I went to check the file, like half of the tiles where gone the file was basically cut in half. Anyone got any idea how this could happen? I'm gonna have to reload via a system restore and work with what I can.
Maybe something went wrong when saving your tileset, although I have never heard about such a bug so far.
In any case, always make backups.