Snow golem doesn't drop its pumpkin after shears it

Summary:
When shears a Snow golem , it doesn't drop a carved pumpkin.

Steps to Reproduce:

1. Shear a Snow golem.

Observed Results:
The head pumpkin will be removed.

Expected Results:
The pumpkin should drop as a item.

Fix:
Make a new loot table named shear_snow_golem or something like that.