Changing default shell breaks plasma

[Tom Moyer]

Similar to the report https://bugs.launchpad.net/snapd/+bug/1961791, when I change my default shell to /usr/bin/zsh I see a similar breakage. After changing the shell from bash to zsh and rebooting, I get the login screen but then nothing after that until I see that kspalshqml has crashed. After changing my shell back to bash, everything works as expected.

Release:
% lsb_release -rd
No LSB modules are available.
Description: Ubuntu 23.04
Release: 23.04

Package Version:
% apt-cache policy plasma-desktop
plasma-desktop:
  Installed: 4:5.27.4-0ubuntu1
  Candidate: 4:5.27.4-0ubuntu1
  Version table:
 *** 4:5.27.4-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu lunar/universe amd64 Packages
        100 /var/lib/dpkg/status

Expected behavior:
Changing default shell to /usr/bin/zsh does not break login

What happens:
Changing default shell to anything besides bash seems to cause KDE to be unable to start

Steps to reproduce:
1. Install Kubuntu 23.04
2. Install zsh (apt install zsh)
3. Change default shell to zsh (chsh -s /usr/bin/zsh)
4. Reboot
5. Login
6. Wait for ksplashqml to crash

Potential workaround:
Instead of changing the default shell, I have configured Konsole to run /usr/bin/zsh instead of /bin/bash. This enables me to continue to use zsh when I am logged in physically and when logged in remotely, I can easily just run /usr/bin/zsh if I want to keep using my normal shell of choice. Not an ideal UX but workable