How fancy! I believe zsh is the default shell for Debian and friends now and has been for a bit. I know it is in docker containers and it's a royal pita.
Discussion
With Debbie Trixie as a daily driver, I'm genuinely surprised I missed that. 🤣
Debian*
Actually I can't seem to confirm that. I'd definitely like to know if that's the case for you! I don't daily drive Debian but on the servers I interact with, it's the default but that could be my vps providers or upstreams. I'm also 99% sure that's the case on ubuntu docker images.