When water interacts with azalea or flowering azalea it will or will not break it depending on where the water is coming from. If the water comes from the side it will break, but if the water comes from the top it will stay.

Expected result:

Water breaks azalea block from both the top and the side.

Actual result:

Water breaks azalea block from the side, but not from the top.

How to reproduce:

1. Create a flat terrain
2. Place two grass blocks a few blocks apart, one on top of the flat terrain, one replacing the flat terrain.
3. Place azalea on both grass blocks.
4. Place water on the highest azalea.
5. Notice how the water broke the azalea when it came from the side, but kept it when it came from the top.