Hi, I noticed this bug due to scoring on 'Subject: zsh' in my client so I didn't verify it on my own, but please see #351031 for my bugreport two years ago regarding the /usr/share/debconf/confmodule problem when using zsh as /bin/sh. (This was the point where I gave up using zsh as /bin/sh on Debian.)
HTH && regards, -mika-
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