Ever since the past 2 updates? First noticed it September 2021? Passive mobs that have been present in my minecraft world for the past 5 years have begun to disappear. An example would be a boat with a horse in it that had been tethered to my dock for many years is now gone, villagers that had been present for ever are now gone, a stable full of horses (with their diamond armor) gone, stands used to store weapons … gone. Made a new village, had plenty of beds, village completely empty next time the game was loaded. None of these disappearances would be from hostile mobs attacking because everything is always completely gone without any trace. Also hostile mobs would not be getting rid of the boats or stands. There is no obvious pattern to the disappearances because sometimes the mobs and objects will stay for a couple of days and then be gone when the game is reloaded.