When placing any mob heads in dispensers they don't dispense.
the item count does not go down or item dispensed.
Issue can be see in this gfycat.
Skulls do not get put on players with a dispenser
Dispenser does'nt drop heads
Dispenser filled with skulls bug/ Shooting particles bug
Dispensers do not equip Skulls.
Skulls don't drop out of dispensers when the dispenser is activated.
Armor shields and elytra are dropped by dispenser if they cannot be equipped but skulls and pumpkins are not