Flowerpot achievement will not complete

Not sure if version above is correct. Running Pocket Edition v0.15.6
I have collected clay, made bricks, crafted a pot, placed it, and put a flower in it several times and the achievement will not complete

I have also noticed that if you pick one flower and plant in the pot, you still have that flower in your hand. You cannot put this duplicated flower in another pot, but you can plant it back in the ground.

*Steps to Reproduce
1. Craft a pot and place (no achievement activated.)
2. Pick flower
3. Place flower in pot (cause duplicate.)
4. Try to place duplicate in another pot. (Doesn't work)
5. Discard of duplicate by planting in ground. (still no achievement)