After y number hits 80, the wool or blocks become "x-ray" like blocks.
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Ezekiel
migrated
Its not about the y level, but about the chunks. empty chunks will render no blocks even when you place some blocks in them. https://bugs.mojang.com/browse/MC-57064
Duplicate of MC-56917 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.