nc(1) fails the tls handshake when destination ends with a full stop

Hi,

$ nc -zvc openbsd.org 443 # works as expected
Connection to openbsd.org (129.128.5.194) 443 port [tcp/https] succeeded!
TLS handshake negotiated TLSv1.3/AEAD-AES256-GCM-SHA384 with host openbsd.org
[...]

$ nc -zvc openbsd.org. 443 # fails
Connection to openbsd.org. (129.128.5.194) 443 port [tcp/https] succeeded!
nc: tls handshake failed (handshake failed: error:1404B42E:SSL routines:ST_CONNECT:tlsv1 alert protocol version)


And FWIW I get a different error when the destination runs nginx:

$ nc -zvc px.chown.me. 443
Connection to px.chown.me. (198.48.202.221) 443 port [tcp/https] succeeded!
nc: tls handshake failed (handshake failed: error:1404B417:SSL routines:ST_CONNECT:sslv3 alert illegal parameter)

I checked with -Tnoname to be sure, and it didn't change anything.

Is that normal?

Cheers,
Daniel