It appears to be a semi common issue here however it persists in my realm; myself and the rest of my realm members are frequently obstructed by invisible walls along random chunks. This started a little over a month ago and remains in 1.8.1.
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We're tracking this issue as MCPE-55671, so this ticket is being resolved and linked as a duplicate.
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Yes I have experienced this as well when I traveled to find a jungle. Not using a horse helps prevent it but then defeats the purpose of horse for faster traveling. Also we have to travel to find a lit of things 1000, 3000, 5000, and 8000 blocks away from spawn usually to find important things and biomes. So we are getting penalized for normally expected and key components of game . . . ADVENTURING