All passive mobs intereacted with are gone

I've had this world for a few days now with my friend's but i was playing all day yesterday and everything was fine, i had a wool farm with 20 sheep, a crap ton of chickens and my friend had a pig farm. apart from that we had 2 foxes named bennedict and fundy with name tags and a few tamed animals. I'd built an iron golem and we had a bunch of villagers too.

i log on today and i noticed my armorstands were just gone, then i noticed some of my cats were gone and so were some fo my wolves.  I thought it was a glitch because only 2 out of my 20m sheep and about 10 chickens and 1 pig were left. so i closed the game, restarted it and went back in and thats when it got worse, all my sheep, all but 2 chickens, all my wolves, all the cats, the foxes, my friend's goat and axolotl, all of my other friend's pigs, my horses (which were on leads in a fenced off area) and all the villagers were just gone, theres no trace of them, they coulnd't have been killed by a mob, its on peaceful mode, the foxes were name tagged, two villagers were in a boat and they're just gone, nothing left behing, gone with the boat, gone with the leads. they're all just nowhere to be seen.

theres no reason for it either. i own the world, i wasn't hacked for all i know and I don't know what to do