Torches spawned naturally in the map for lamp posts in villages and mineshafts are placed on air blocks.In this issue : https://bugs.mojang.com/browse/MC-2512 ,the problem has fix,but in the older versions.
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Duplicate of MC-56974 - 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.