Chunks will not render quite frequently on 14w27a & b. This has help me find many dungeons and mineshafts, but regardless, it is very annoying and can only be fixed by changing the render distance one way than back to it's original setting, so the game renders them again.
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Dupe of MC-56897
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Try turning off Advanced OpenGL if its on. I tried this and it fixed it for the area that wasn't loading. Haven't checked all of my world though yet. Is the ground like invisible but still interactable though?