Function entity_providers 

pub fn entity_providers<T, C>(
    key: &EntityCapabilityKey<T, C>,
    host: &dyn Host,
    entity: EntityRef,
    context: C,
) -> Option<EntityProviders<T, C>>
where
    T: 'static + ?Sized,
    C: Copy + 'static,

The providers mods registered for key and the type of entity, for the game’s own lookups (a hopper’s): none where no mod registered one, so a vanilla container entity’s lookup costs one table check and allocates nothing, and the game needn’t work out its own answer. EntityProviders::ask then asks them, as the game’s lookups for block entities do.