I recently ran into a problem where my game crashed and it appeared to have deleted my world. Other people have had this problem but their tread was closed so I couldn't post on it. Just want to let everyone know that if your world gets deleted like this and still has a save file in your mod directory, you can restore it by creating a new world with the same name as the name of the original file. I don't know if this works if the world has been renamed though.
Hope this is helpful.
Hope this is helpful.