All of my Worlds Missing Whenever I Open the Game.

To the awesome team of Mojang,

After not playing for a few months, I decided I would give Minecraft: Java Edition a go again. (I was playing on the latest version: 1.20.2,) But the first thing I see when the game loads is a window asking me if I want the narrator on, and I was pretty sure it only asks that the first time you ever play, and sure enough, when I click the Play button, all of my worlds were gone. I wasn't too bothered because I didn't have that many, so I went ahead and made a new one. I worked incredibly hard on a house that uses multiple build hacks that require complex commands. I was proud of myself when I was done, and it was late, so I saved the game and closed Minecraft. Then, this morning, I woke up and got on Minecraft again to add some more things to my house. But then again, I see the window asking me if I want the narrator on, and there went my world again. I obviously was disappointed, and I decided I would open the game on the latest Snapshot, (23w41a,) to see if anything changed, and I saw all of my old worlds except for the one I made yesterday, so something clearly isn't right. Could you maybe tell me how I can fix it possibly? 

                                                                                                             Kind Regards, HD-Bricks