Mine was different a screen showed up and say "Your world was corrupted pls reopen or play the backup" then I reopen it, I thought nothing happened so I went building a skeleton farm but when I went to my house to get some iron, It was different my house was gone but no chunks were deleted just my house and my storage room and my mining area, it just went to its original like I never explored it. So I went to the minecraft folder and to my world folder and I press the Db folder and I saw a "Lost" folder