I was trying to play on my survival world when I saw it wasn't there. So I decided that I accidentally deleted it but when it happened again to my a test world I was confused I decided to check my saves folder and both of my worlds where there! But I never got to open them ever again 😞 I don't know how this happens but I am asking you to fix this bug before it does anything very bad to any maps i'm working on.
Please attach the complete output of the "Development console" which can be found on the second tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".