net-vpn/openconnect installs a bash completion script in /etc/bash_completion.d/openconnect.bash. This script is broken, because the hardcoded openconnect path is invalid: it has /home/dwmw/git/openconnect/gtls-ibm/openconnect, while it should be /usr/sbin/openconnect.
It should probably install to /usr/share/bash-completion/completions/, too.
Should be fixed in 8.10.