I went through a nether portal and as I did I was one hit killed by a piglin and my game crashed, so I relaunched the game and tried to load my world up again and it kept getting stuck on building terrain so I made a copy of the world and tried launching that one and that kept getting stuck on building the terrain so I quit out of the game and left it for the night the next morning it tried again and it kept getting stuck on building the terrain so I quit out and uninstalled the game and when I reinstalled it and checked again the world and it's copy I made was gone so I checked all my worlds and there was two new ones at the bottom with new names which they have to be my world and it's copy because of the dates i haven't made a new world for a while because of of this world