I can confirm the same bug on Debian unstable, console-setup 1.164:
Apr 27 11:33:08 debian-pc systemd[1]: Starting Set console font and keymap... Apr 27 11:33:08 debian-pc console-setup.sh[537]: /bin/setupcon: 866: /bin/setupcon: cannot open /tmp/tmpkbd.voFOYG: No such file Apr 27 11:33:08 debian-pc systemd[1]: console-setup.service: Main process exited, code=exited, status=1/FAILURE Apr 27 11:33:08 debian-pc systemd[1]: Failed to start Set console font and keymap. Apr 27 11:33:08 debian-pc systemd[1]: console-setup.service: Unit entered failed state. Apr 27 11:33:08 debian-pc systemd[1]: console-setup.service: Failed with result 'exit-code'.
