Snow golems with pumpkins sheared off regain pumpkins

With 15w49a, the ability was added from MCPE to shear off the pumpkin head of the snow golem, to reveal their "derp" face (see jeb on twitter https://twitter.com/jeb_/status/670277230895960064). But upon quitting the world and reentering, all derpface snow golems have regained the pumpkins on their heads.

What I expected to happen:
Snow golems whose head pumpkins I've sheared off should not have pumpkins on their heads even after I quit and rejoin

What actually happened was:
Snow golems whose head pumpkins I've sheared off have pumpkins on their heads after I quit and rejoin

Steps to Reproduce:
1. Spawn a snow golem with two blocks of snow and a pumpkin on top.
2. Shear the snow golem's head, exposing his derp face
3. Press escape to exit your world. Then enter world again, and observe snow golem face.