I had 3 cows, 2 pigs, 2 sheep, and 2 chickens in a fairly small fenced area. After a mining trip of around ~2 days, and upon returning to the fenced area, I only had 3 cows, 1 pig, 1 chicken, and no sheep.
MCPE-13228
Animals either despawn or escape from fenced area
Resolved
Cannot Reproduce
0
I am afraid we can not reproduce this bug in the recent version. Please update affected versions if this bug still occurs.