The hitboxes of players and other mobs can round to 0 due to floating point errors beyond 2097152 blocks on any coordinate.
This bug can get SERIOUSLY dangerous beyond 8388608 blocks, because if you're not riding a horse beyond that point, you will fall through the entire world and die in the void.
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We're tracking this issue in MCPE-11418, so this ticket is being resolved and linked as a duplicate.
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