Pathblocks

What i thought was that when a sign placed on a wall above a pathblock would not destroy the pathblock

instead the pathblock turned into dirt

Steps to Reproduce:
1.Put a pathblock down
2. put a sign on a wall above it
3. then the pathblock turns to a dirt block

Since the pathblock is 15/16 type of block it makes little sence that the sign would go to the next block radius