deleted chunks after unexpected shut down of system

hello Mojang,

• unfortunately my pc got shut down due to some electrical problem in lines, but as I was in minecraft in overworld, and when next time I entered in, I got multiple chunks got erased, some chunks had taken its original form where all i had built the farms, terrain and trees which I have terraformed have again re-appeared, im currently playing 1.18.20 version, I'm even sending the screenshots of the deleted chunk areas which i took in creative mode from above land and below bedrock