Horses no longer open their mouths while grazing after the version 17w45a

Java version of MCPE-19583.

The bug

The horse model has been changed in aquatic update, however the mouth has been removed from the horse model, making them no longer able to open their mouths, but the sound they make when they open their mouth is still present. Usually, when the horse is idle you will see the mouth opening animations followed by the sound they make when they open their mouths.

Steps to reproduce

1. Summon a horse
2. Waiting it make the sound

← The horse never open its mouth.

What animation I'm talking about?

1. Attack a horse, or waiting the horse make the sound
2. Notice the horses mouth just opened.