invisible wall like a world border will stop me from going past this is the second time it has happened both on X and Y the only way to fix it is to reload world but the second time i did this i respawned at the world spawn in the air and died i didn't spawn at my bed which i did after i just died. im not sure if this happens in other worlds.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-38868 / MCPE-38374.
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