floating sand and gravel genorated

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
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but it does not crash the game

please reopen for this does not crash the game

But it is a duplicate. Please search first, and provide a proper description if you can't find a duplicate.

sorry I put it in the wrong box 😞