Zombie Pigmen "hat" layer desynced with head

Partner Rank: 3

Partner Team Reporting: Noxcrew

Verification builds: 1.9.0.14

Summary:
The Hat layer on the Zombie pigman is not synced with the head. In Tinyfootprints it also appears at the feet of the entity

Impact:
This appears broken in both Tinyfootprints and Adventures' Dream Texture packs.

Repro Steps:

1. Download Adventures' Dream Texture pack from the Store in 1.9+
2. Create a new world with cheats enabled
3. Spawn a zombie pigman
4. Observe the hat layer not synced with head movements
5. Repeat on 1.8
6. Observer the head sync'd

Observed Results:
The hat layer does not follow the direction of the head

Expected Results:
The hay layer follows the direction of the head

Screenshots/Videos attached:
Yes

Notes:
We originally reported this as related to MCM-487