Function azalea_world::deduplicate_entities

pub fn deduplicate_entities(
    commands: Commands<'_, '_>,
    query: Query<'_, '_, (Entity, &MinecraftEntityId, &WorldName), (Changed<MinecraftEntityId>, Without<Local>)>,
    loaded_by_query: Query<'_, '_, &mut LoadedBy>,
    instance_container: Res<'_, InstanceContainer>
)

Remove new entities that have the same id as an existing entity, and increase the reference counts.

This is the reason why spawning entities into the ECS when you get a spawn entity packet is okay. This system will make sure the new entity gets combined into the old one.