All of my named animals, dogs, cats, birds, and horses, disappeared.

I logged back in to continue playing my creative world when I spawned in and saw every single one of my dogs, cats and birds had gone missing. There were so many of them which shocked me, cause how could all of them just disappeared like that. And I play this world alone so no one else could've killed them. I had all of them named, and now they're just gone. I'm not gonna lie, I'm one of those people that gets attached to video game pets so this made me so sad lol. what made it worse was that I'd played the world for so long and some of those dogs were from day one 😞 I even still had beef and fish in my inventory for them. Has anyone else experienced this? Mojang please look into this so neither me or anyone has to go through this kind of loss again. Thank you- hennex8348