I noticed on a realm after coming back from the Nether some Mobs would disappeare example: horses and sheep.
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Reposted my comment from MCPE-23404:
We just saw this issue as well.
MS hosted Realm
Android MCPE (1.1.3)
both Amazon Fire Tab 7 and Samsung Galaxy Tab A
Brand-new nether portal created by our main homestead. We went into the nether portal - stayed about 2 minutes - then came back.
All sheep, cows, chickens, pigs, and horses had despawned from our pens and pits. This included armored & saddled horses.
We also lost all paintings inside our house.
Definitely a large bug that needs to be fixed.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-21416
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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This needs to be combined with MCPE-23404.