Breaking a campfire by hand or pickaxe returns 2 coal to the player, however a campfire is mostly crafted out of wood and should return 2 charcoal (as it is currently working on the java edition snapshots, tested 19w06a).
Steps to reproduce:
- Place a campfire with experimental gamplay enabled
- Break a campfire by hand or by pickaxe (survival)
- Look at the drops
The campfire to drop 2 charcoal when broken.
The campfire drops 2 coal when broken.