What were you using to configure networking on the target machine? NetworkManager, ifupdown, something else? I found that with ifupdown, you see the issue, as

What were you using to configure networking on the target machine? NetworkManager, ifupdown, something else? I found that with ifupdown, you see the issue, as it uses dhclient which in turn calls out to dhclient-script, which is written in bash. If you use NetworkManager, it doesn't call dhclient-script; it does however call the scripts in /etc/network/if-.d, and if any of those are written in bash, then you see the issue. None of the scripts in /etc/network/if-.d on my system used bash, they all used /bin/sh, so on a Debian system where that points to dash instead of bash you're OK.