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Btw,don't confused with positive and negative coordinate.Only negative coordinate show infinite ocean only.Positive coordinate show normal far land.Can you give screenshot?

The far lands are an entirely different issue themselves as the physics don't even work there. These occur due to floating point precision errors.I do not believe Mojang will attempt to fix this issue but rather close off the far lands all together as they did in MCPC.

The farlands themselves are the result of various unintended overflows and issues related to them are not accepted here.