Minecraft world deleted

My Minecraft world has been deleted by the game about 4 times. 3 times in the past 2 days using 20w19a and once using 20w17a. Being the idiot I am I forgot to create a backup after all 3 times the past two days and when trying to use the world after closing the game and going back in through the launcher, it forces me to create a new world. luckily I had a backup of 20w18a and only lost about 50 days. Still very sad about the things I lost but bugs are bugs and are meant to be fixed. Hopefully this never happens again. Thanks. L_?