when you place a sign on a block then destroy the block it wont give you the sign back

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
The sign would drop and give it back to me

What actually happened was...:
Describe what happened here
The sign dissapeared

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...place a sign on the side of any block
3. ...destroy the block that its on the side of