Z-fighting occurs on chickens' feet from some angles when entity shadows are enabled

The Bug:

At certain angles, and heights, the feet of chicken have heavy Z-fighting. This bug is present older versions as well. 

This behavior can also be seen in the video below:

How to Reproduce:

1. Summon a Chicken with No AI, and look at its feet

2. Rise above it a bit or to the side of it until at a specific angle. It will start to have heavy Z-fighting issue

3. Also take note that below a certain distance the chickens feet are very light, and above a certain distance they are dark. This shows the Z-fighting is a threshold between these two points