Entity Despawn (including horse with armor, axoltl with name tag, armor stands?)

While I was digging a huge tunnel for a storage room, I suddenly quit the game without clicking save and quit. When I return all of my villager was gone, armor stands, cats with nametag, etc.
I know my cows and pigs and chickens can despawn but armor stands? Paintings?? Is there any way I can get them back? I've been playing that survival map with achievements for quite a while and losing a big part of the progress really is bad. Pls fix it