LinkAttribute in LinkAddRequest ignored?

[KarstenB]

I am trying to create a veth pair with a fixed number of rxqueues.

On the shell I do:

ip link add dev veth0 numrxqueues 1 type veth peer name veth1
ip -j -d link show veth0 | jq '.[0].num_rx_queues'
# 1

However the following code produces a veth0 with 32 rxques af it the attribute was ignored.

#[cfg(test)]
mod test {
    use futures::TryStreamExt;
    use netlink_packet_route::link::LinkAttribute;

    #[tokio::test]
    async fn test_veth_creation() {
        let (connection, handle, _) = rtnetlink::new_connection().unwrap();
        tokio::spawn(connection);
        let mut request = handle.link().add();
        request
            .message_mut()
            .attributes
            .push(netlink_packet_route::link::LinkAttribute::NumRxQueues(1));
        let if_name = "veth0".to_string();
        let peer_name = "veth1".to_string();
        request = request.veth(if_name.clone(), peer_name);
        request.execute().await.unwrap();

        // Interface should be created by now with 1 RX queue
        let num_rx_queues = handle
            .link()
            .get()
            .match_name(if_name.to_string())
            .execute()
            .try_next()
            .await
            .unwrap()
            .map(|link| {
                link.attributes.iter().find_map(|attr| match attr {
                    LinkAttribute::NumRxQueues(link) => Some(*link),
                    _ => None,
                })
            })
            .flatten()
            .unwrap();
        assert_eq!(num_rx_queues, 1);
    }
}

The test fails and it shows 32 queues.

ip -j -d link show veth0 | jq '.[0].num_rx_queues'
# 32

Am I doing something wrong?
Thanks for any help in advance,
Karsten