Has been fixed in LibreSSL. Thank you!
- gnutls cannot connect to openbsd.org -- TLS 1.3 issue? openbsdlists
- Re: gnutls cannot connect to openbsd.org -- TLS 1.3 ... Stuart Henderson
- Re: gnutls cannot connect to openbsd.org -- TLS 1.3 ... openbsdlists
Has been fixed in LibreSSL. Thank you!