Coarse Dirt turned into Farmland transformed into regular Dirt

Turning some Coarse Dirt into Farmland and then making it back to normal (by jumping on the Farmland) transform the Coarse Dirt into regular Dirt.

Screenshot 01: Coarse Dirt.
Screenshot 02: Coarse Dirt turn into Farmland.
Screenshot 03: After "detroying" the Farmland by jumping on it, Coarse Dirt transformed into Regular Dirt.