This bug is already old, there arose some versions, I can not tell which version exactly the bug came, I playing in 14w32c 1.7.10 and the bug is still there. The bug is in a kind of "black hole," an area without any block and insurmountable, if I jump inside I am unable to leave. Currently I am aware of two of these "black holes" in my world, I made a video in which I describe the bug, it's in Portuguese, but there is nothing so important that I speak in video, see the video and you'll understand my bug:
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i believe most likely is because the chunk didnt load in.. but if it stay very long like about 1 minute then it will be a bug?
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I do not know how the bug originated, just know that he's still there every update.