Windows Solo world disappeared :(

dotopita

Newcomer
My year 6 solo world is gone from the load games screen and I have no idea how to get it back. I went to my sister's house and played it while connected to her wifi which is the only unusual thing I've done with the game/my computer recently. It was also working just fine yesterday when I was back home. No idea why it disappeared, can anyone help??
 
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