I was using the windows 10 game mode to play Minecraft and it was normal at a first moment but it started to run so slow that my entire computer almost crashed when the Xbox stats loaded, I managed to load my world and my computer's screen crashed and shut down; I forced shut down to recover my computer and I was able to do a backup before all of this so nothing happened to my world; the original files were corrupted and the world did not appear in the game so I searched its level.dat and was filled with null.

I switched down the game mode since all of this happened.