How to listen for QUIC connections using the new NetworkListener in iOS 26?

I was excited about the new APIs added to Network.framework in iOS 26 that offer structure concurrency support out of the box and a more modern API design in general.

However I have been unable to use them to create a device-to-device QUIC connection. The blocker I ran into is that NetworkListener's run method requires the network protocol to conform to OneToOneProtocol, whereas QUIC conforms to MultiplexProtocol. And there doesn't seem to be any way to accept an incoming MultiplexProtocol connection? Nor does it seem possible to turn a UDP connection into a QUIC connection using NetworkConnection.prependProtocols() as that also only works for network protocols conforming to OneToOneProtocol.

I suspect this is an accidental omission in the API design (?), and already filed a Feedback (FB18620438).

But maybe I am missing something and there is a workaround or a different way to listen for incoming QUIC connections using the new NetworkListener?

QUIC.TLS has methods peerAuthenticationRequired(Bool) and peerAuthenticationOptional(Bool), which makes me think that peer to peer QUIC connections are intended to be supported?

I would also love to see documentation for those methods. For example I wonder what exact effect peerAuthenticationRequired(false) and peerAuthenticationOptional(false) would have and how they differ.