Since the fix for -SPIGOT-3629- each EntityEffect comes with data about what entities are affected by that effect. In Some cases this is incomplete.

1. DEATH(3, LivingEntity.class) is also used to make Snowballs and Eggs crack
2. SHEEP_EAT(10, LivingEntity.class) is also used on ExplosiveMinecart to trigger its prime animation
3. GOLEM_ATTACK(4, IronGolem.class) is also used on EvokerFangs to trigger their biting animation and play the ENTITY_EVOCATION_FANGS_ATTACK sound.

In these cases the missing Entity types are not sub classes of the already given applicable class.