If i put a Wither skull or pumpkin in a dispenser and connect it to a Button or/and Lever it won't come out. Please fix this bug cause it's really bottering m e. Thanks for the awesome game ;D
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Comments 7

Use a dropper.
Similar to bonemeal then - only dispenses when putting it on some sort of plant/grass/etc. If you just want it to drop it rather than place it, try using a dropper instead.
Why can armor and such be dropped by dispensers + equip players with armor? This should be fixed by either removing the ability for dispensers to drop items or make all items that has no "dispenser use" be drop-able, if no conditions of "dispenser use" is met.
I think Mojang should decide on this.
Ah, it's confirmed to be intended by Mojang. See @unknown's comment at MC-8199.
If nothing can be spawned and nobody stands in front of the dispenser, the item will not be dropped into the world. This is an intended behavior.
So, should a new ticket be created for dispensers being able to drop armor and alike?
Yes.

@unknown and @unknown, that is now MC-114107.
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.