The Chunks Moved

My problem is that I was playing minecraft calmly but suddenly the screen went black, I tried to do everything but not to do anything, the last option I had was to turn off the computer but I was afraid that the world would not be saved, when I turned it on again And when I entered Minecraft Java, I saw that if the world had been saved, when I entered the world, I saw that the chunks had changed places, that is, that my house was divided into 4 parts and those four parts were on different sides of the world. a chunk of the ocean in my spawn and everything was changed and on occasions the chunks were repeated, that is, that a second house that I was building was in a single chunk but it multiplied and there were several chunks from my second house scattered in the world hopefully help me in this problem