Goat knockback is not bound to attack knockback attribute

What I expected to happen was...:
Goat knockback being changeable with attributes

What actually happened was...:
Goat ram knockback being locked and not changeable with commands

Steps to Reproduce:
1. summon a goat with the attack knockback set to any number

/summon minecraft:goat ~ ~1 ~ {Attributes:[

{Name:"generic.attack_knockback",Base:100f}

]}

2. goats rams an entity

3. entity distance doesnt change no matter the value of the attribute