Dispensers don't drop pumpkins, jack o lanterns or wither skulls

^{Update by [Mojang] Mega_Spud (Jay Wells):}
As of 1.1.0.0, the following issues are present:

• Jack o'Lanterns should be ejected/dropped from a dispenser
• Dispensers will place Jack o'Lanterns on snow/iron blocks to spawn golems (possible intended PE feature)

See this comment for an updated comparison between PE and Java

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Original Description:
Pumpkins, jack o lanterns and wither skulls don't drop when dispensed in a dispenser.
LG G2 Lite