Carved pumpkins on snow golems' heads are rendered as blocks rather than items

Most counterintuitively, the carved pumpkin on a snow golem specifically points to the block model, rather than the item model with the “head” display type. This means that modifying the model’s “head” display type will result in the appearence changing for all mobs except for the snow golem, which is obviously inconsistent.

A resource pack that gives placed carved pumpkins a distinct appearence from item carved pumpkins is attached that can be applied to reproduce this issue by comparing different entities as is depicted in the attached screenshots.

This could be fixed by having the carved pumpkin be an item in each snow golem’s head slot (much like what is done for copper golems), rather than a boolean attached to the entity data. This would also fix other inconsistencies such as MC-273607.