Duplicating bug snapshot 13w37b

Put the summary of the bug you're having here

What I expected to happen was...:
I put a flower pot on the grass then i break the block under the flower pot and get a flower pot and one of the flowers

What actually happened was...:
i break the block under the flower pot i get a flower pot and get two flowers

Steps to Reproduce:
1. put the flower in the pot
2. break the block under the pot
3. and you will get two flowers