Steps to reproduce:

1. Obtain a flower pot
2. Try to place it on any leaves

Observed result:
You can't.

Expected result:
You can.

Original description:
Summary: Flower pots can't be placed by hand on top of "thin" blocks and leaves but can be placed using the setblock command which is not survival friendly.

Steps to reproduce: Place end rod, iron bar, chains or leaves then try to place a flower pot on top of it, it wont place it.