water or lava dosen't break paintings.

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
What I thought is when water/lava hit paintings,it would break.
What actually happened was...:
Describe what happened here
It didn't and kept on flowing like nothing happend.
Steps to do the bug
1.Get water/lava and a painting.
2.put the water/lava next or on the painting.