I think they will only dispense if they will make a golem/wither when placed. Try making the pumpkin dispense on top of the Iron/Snow Golem structure. I also had trouble with the Skeleton Skulls too though, only emitting smoke.
I think they will only dispense if they will make a golem/wither when placed. Try making the pumpkin dispense on top of the Iron/Snow Golem structure. I also had trouble with the Skeleton Skulls too though, only emitting smoke.