Function update_source 

pub fn update_source<C: Component + Clone + PartialEq, F: QueryFilter, R: Relationship>(
    commands: Commands<'_, '_>,
    changed: Query<'_, '_, (Entity, &Propagate<C>), (Or<(Changed<Propagate<C>>, Without<Inherited<C>>)>,)>,
    removed: RemovedComponents<'_, '_, Propagate<C>>,
    relationship: Query<'_, '_, &R>,
    relations: Query<'_, '_, &Inherited<C>, Without<PropagateStop<C>>>,
)

add/remove Inherited::<C> for entities with a direct Propagate::<C>