A black stripe in the horison that can be seen whatever horisontal direction you are looking at. Not visible behind blocks.
This bug happens when new chunks are being generated. It sometimes disappear for a second when many blocks above ocean level. It will instantly vanish sometimes if touching water, but will reappear shortly after you have left the water. This happened in multiplayer, i am not sure whether or not it also happens in singleplayer.
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This issue is a duplicate of MC-62175. It has been linked to the original bugreport.
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