mobs will glitch through blocks upon chunk entry or world entry. I had about 40 villagers in a 7 x 2 x 1 area and when I loaded the chunks they flew allover the place. it only works if the mobs are on the edge of the chunk as far as I can tell.
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[Mojang] Mega_Spud (Jay)
migrated
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-1982.
It has been linked to this report. If you have additional information, please add it to that report.
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