Apatosaurus (Creeper) model looks bad

Summary: Apatosaurus (Creeper) is leaning backward when it is standing up normal. It looks awkward/strange.

Verification builds: 1.12.0.2

Repro Steps:

1. Load the Dinosaur Island world template.
2. Enable cheats.
3. Spawn an Apatosaurus (replaces Creeper).

Observed Results:

The model is leaning awkwardly backward. Weird posture.

Expected Results:

It isn't supposed to lean back like that when walking.

Screenshots/Videos attached: Yes