Unknown object on service activation

I observe an activation bug (somewhat reminiscent of #68 (closed)), with a system activated service on fc34:

#[async_std::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let connection = Connection::system()
        .await?
        .request_name("org.freedesktop.usbredir1")
        .await?;

    connection.object_server_mut().await.at(
        "/org/freedesktop/usbredir1",
        Interface::new(&connection).await?,
    )?;

    loop {
        let listener = connection.monitor_activity();
        if !listener.wait_timeout(Duration::from_secs(10)) {
            break;
        }
    }

    Ok(())
}

I get a reliable error on activation (subsequent calls ok while the service is running):

$ busctl call org.freedesktop.usbredir1 /org/freedesktop/usbredir1 org.freedesktop.usbredir1 OpenBusDev yy 1 59
Call failed: Unknown object '/org/freedesktop/usbredir1'

Interestingly, if I modify zbus to request the name after the server is setup, I don't get the race or the issue or the timeout from #68 (closed).