[exploderate]

Or

1) SSL

2) HTTP/3

3) Other (DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP)

[gnyman]

Fiver on 2)

Matches the "few years back"

Luckily HTTP/3 is so complex I doubt anyone could find the issue even if they looked :-)

[alkonaut]

b) and 2) is my bet.