Minecraft world spontaneously disappears with no actual explanation

My Minecraft world spontaneously disappears with no actual explanation, last time I was doing anything that delt with it, I was loading into the world. I might of closed the game, All I'm comfident in is that the game doesn't delete your world if you're simply exiting out of the game, because of it's "Autosave" mechanic.

I Report this as a Minecraft - Private because recently my Microsoft account was also logged out of, which obviously is odd, and with that little evidence I could have an idea that maybe someone hacked into my account? unsure either way I want both of these issues fixed please