Vex's new model's head does not rotate to where it looks

The Bug

Relates to MC-250295, a similar issue that happened to Allays when they were first introduced.

The Vex's new model's head does not rotate to where it is looking, despite both the Allay and the old Vex model being able to do so, as seen in these images:

Old Vex model rotating its head

New Vex model unable to move its head despite looking to the side

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Steps to reproduce:

1. Summon a Vex, and watch them fly around.

2. They will not turn to look at anything

3. Enable hitboxes to see their line of vision; although they technically are looking around, their head does not rotate.