Enchanted Snowballs that have custom enchantments through datapacks don't call minecraft:post_attack when hitting an entity.

Steps to reproduce:

1. Create a datapack with a custom enchantment that is able to be placed on snowballs (example enchantment json below)
2. Open the world and gain an enchanted snowball
3. Throw the snowball at an entity
4. The function in post_attack wont run