When you set a small plant, like the rose on a dirt block and put a block that has physics to it, like sand, gravel, or an anvil on the flower, they will float when you destroy the block that the flower is growing on.
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Duplicate of MC-19886 - 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.