I was playing minecraft and wondered if I could til or hoe coarse dirt, and I could but when I mined in it turned in to dirt not coarse dirt

What I expected to happen was...:
To give me my coarse dirt back

What actually happened was...:
The block dropped dirt.

Steps to Reproduce:
1. Place a block of coarse dirt down.
2. Use a hoe on the coarse dirt
3. mine the coarse dirt

Is this a bug or not?