Don't unload houses as soon as you leave one.

[Pills]

Taking any wild animal that you have used a clover on into a house and walking outside for just 1 second while leaving the animal inside causes the animal to just despawn. Covered animals should prevent the map from being unloaded instantly, atleast for a reasonable time

[Artemiswhb]

+1 just had a horse disappear on me by walking outside without it for literally 1 second