World made in 16w41a can't be detected

A map I made cannot be detected. Other maps I made in the same snapshot can be detected, just this one doesn't seem to get detected by minecraft for some reason. The save file is still in the "saves" folder and I ensured that it wasn't a folder in a folder problem but the game still wouldn't detect it. I also tried to rename it but it still doesnt work. I've included the save file here.