Lost World Windows 10 v1.16

Logged on today to find my world has gone. I can not see it in the appdata - Gaming file either and I can not see/find it in the saves. I don't think I have a save folder.

Please note I was not actively or manually saving the game to the PC - I am new to it I did not know I needed to.

Has it gone forever, my son will be crushed !

Thanks

Daniel