See screenshots.
nodrops.png: Screenshot of the generated sugarcanes and the sand around it
nodrops2.png: Screenshot of the sugarcanes after hitting a couple sandblocks away to trigger the falling of the flying sand.
MC-1363
Sugar canes gets generated while surrounded by non-falling sandblocks
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Works As Intended
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Non-falling sand generation is fairly normal, your screenshot just shows that sometimes sugarcane is generated at the same location.