Sharpness enchantment on thrown trident doesn't work for ender dragon

Sharpness enchantment on thrown trident doesn't work for ender dragon or other mobs with mutiple hitboxes(entities that has green hitbox when use f3+b is on).

Steps to Reproduce:

1. Run command:

   /give @s trident{Enchantments:[{id:sharpness,lvl:255},{id:loyalty,lvl:5}]}
   

1. Go to the end and throw the trident to the ender dragon. It will only take a little damage, the damage from thrown trident itself.
2. But if you attack ender dragon directly, it will take much damage.
3. This bug may occur on other mutliple-hitbox entities if mods is installed.
4. Other enchantments which can increase damage such as smite and impaling may also have this bug.

What I expected to happen was...:
Enchantment sharpness can deal damage to multiple-hitbox entities on thrown trident, like one-hitbox entities(sharpness on thrown trident can deal damage to normal entities).