Hi Philippe, By looking at the code it seems that systemd sets /sys/module/vt/parameters/default_utf8 based on the locale setting which makes sense:
https://github.com/systemd/systemd/blob/master/src/vconsole/vconsole-setup.c#L92 Can you paste the output of 'localectl' ? If it shows UTF-8, try to change it in /etc/default/locale regards, Philipp
