In realms, when I (when single player) or all playing people go through to the nether, all passive mobs seem to despawn in the area.
I had a farm for pigs, sheep, cows and chickens but after visitng the nether, they are all gone.
They are all fenced off and in a fully lit area.
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However, this issue has been closed as a Duplicate of MCPE-21416.
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