I doubt this issue is caused by the game not recognizing the fortress even though there is a fortress there. I've removed all withered roses and replaced the dirt with nether brick. No mobs are spawning on the bricks, there should be mobs spawning on the bricks.
The farm I use has a quad intersection with a perimeter slabbed. The game just doesn't spawn in the monsters.
jouke
I doubt this issue is caused by the game not recognizing the fortress even though there is a fortress there. I've removed all withered roses and replaced the dirt with nether brick. No mobs are spawning on the bricks, there should be mobs spawning on the bricks.
The farm I use has a quad intersection with a perimeter slabbed. The game just doesn't spawn in the monsters.