In minimal-examples-lowlevel/ws-server/minimal-ws-server/, commenting out the lws_callback_http_dummy line (such that the server runs only one protocol) and connecting with the attached python script, the connection times-out, unless lws-minimal is passed as an argument.
I'm running this on Windows, on a commit out of main that is like 2 weeks old.
This behavior seems to be contrary to the documentation that reads:

Websockets allows connections to negotiate without a protocol name... in that case by default it will bind to the first protocol in your vhost protocols[] array.