invulnerable entities cannot be hit by spears in creative mode

entities summoned in creative mode with the {Invulnerable:1b} modifier cannot be hit by spears in creative mode. these mobs are damageable by every other weapon except for spears specifically.

steps to reproduce:

• Summon an entity with {Invulnerable:1b}

• Try to attack it using any type of spear

it should do damage, but it doesn't