Villages and Nether regeneration

Its been the second time in 24h hour i encounter this bug. Yesterday in the nether i was exploring and created a path so i couldnt get lost then few minuts later i quit the game and as i come back the nether looks like no one ever stepped there. In the overworld i wemt for exploration a few 1000 blocks away and as a come back to my primary village, its all gone, my chests, my portal everything was replaced with a new village like i've never bee there, this time this is pissing me off. gotta so playing if this happens often