By now I have not found how to make projectile do different actions when it hit a block or entity.
I'm trying to make a spell which launchs a custom projectile, if it hit an entity, the entity is damaged,
and if the projectile hit a block or reached max range, it will make an AOE damage.

Sorry for the very delayed response... I've been missing a lot of issue notifications.

If you still want to do this I think you need a CheckEntity action to tell if it hit an entity or not.