When yanking a line, the netcat command hangs and vim hangs with it. Running ps -aux, I can see that the -N switch is not being called for the command. It seems to be caused by a change in the nc command help that no longer displays the word "shutdown" in lowercase, but in uppercase instead:

$ nc -h 2>&1 | grep -i shutdown
                -N              Shutdown the network socket after EOF on stdin
$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster