When I break redstone it will not drop

When I break redstone it won't drop

What I expected to happen was...:
Describe what you thought should happen here
It should drop redstone
What actually happened was...:
Describe what happened here
It broke and nothing dropped
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...get an iron pick on survival
3. ...try to dig redstone