Modified enderman still can't be shot with projectiles

Release_809752 from 1.2.13

Summary: Modifying Enderman to remove their ability to teleport makes them possible to be hit with projectiles however they still take no damage.

Impact: In my battle arena map I want to be able to make Enderman susceptible to damage from projectiles. Being unable to do this will make enderman OP for the arena and thus not a viable combatant.

Repro Steps:
1) Edit an enderman behavior to prevent it from teleporting. I have attached a world with resource pack which contains the code to do so.
2) Load up the world.
3) Press the button at the corresponding sign to summon a skeleton and an enderman. To fight each other.

Observed Results: The skeleton will shoot the enderman and the arrows will fly straight through the enderman despite the enderman not teleporting out of the way/

Expected Results: The Enderman should take projectile damage as they are in the direct line of fire.

Video: https://youtu.be/S3EFOMRUsW0
Attached: Repro World /w Behavior Pack included