Surface Pro 4. Survival world. Never used Creative on this one. After exiting Minecraft, and logging back in - mobs which had been in captivity for real-world months suddenly all escaped at the same time. No enclosures were broken. Villagers escaped En Masse from a surrounding glass enclosure. Glass all still in place. Pigs, Chickens and Cows all escaped from 2 x deep pits that had fences around the top. All pits still in place. "Hundreds" + of each type of mob are now running around my base. Especially in places that should not be possible. Like cows up on platforms up in the air. The cows somehow climbed ladders also, and ended up in an otherwise completely enclosed room (only entrance was the ladder). Now full of cows. I realize this is going to be hard to reproduce, plus hard to believe given that this could have all been staged, however I assure you this is legit.
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To give you an idea of the "instant" spread... the pigs used to be (and still are) contained in the top center just to the left of the red structure. (They still are but aren't rendering due to the distance). The enclosure has never been broken. However, suddenly, they are all over this part of the base - see on the bottom center and on the left - the pigs are visible. This isn't the only place, just the only place that is rendering at this distance. They are everywhere. Like flies. Shouldn't be possible.
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Also the only reason I assume they "escaped" not "appeared out of nowhere" is that the villager enclosure only had a handful of villagers after I logged in. First thing I checked. There used to be many. Like, many many, and now they are all running around the base randomly, but the glass enclosure (still intact) only has a tiny number. The pig herd also looks very thinned out in the enclosure. So it appears the "Free" ones came from the enclosure, somehow...
[Mojang] Mega_Spud (Jay)
Thanks for your report! This is however a Duplicate of MCPE-1982 – If you have not, please use the search function in the future, to see if your bug has already been submitted, as currently over 47% of tickets are being closed as duplicate.