if your in old world and have villagers whether you spawn them your self or they naturally spawn, you cant get out of the water, neither can mobs villagers exc. if you dont plan on working on old world anymore, then please add a world generated limit for those who dont want an infinite world please.
Thank you for your report!
We're actually already tracking this issue at MCPE-42058, so I will resolve and link this ticket as a duplicate.
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