When a piston pushes a block with redstone dust on it, the redstone dust doesn't break.

What I expected to happen was...:
When a block with redstone dust on it is pushed by a piston, the redstone dust would break.

What actually happened was...:
The redstone dust did not break, it just stayed on the piston arm/head.

Steps to reproduce:
1. Place any kind of piston down.
2. Put a block next to the piston, so that when the piston is activated the piston would push it.
3. Put redstone dust on top.
4. Activate the piston.

I am using my Samsung Galaxy S6.