The real issue with this isn’t the FireMotD version but the point in time when the hw information cache file gets generated on boot, the network isn’t up yet.
Just fixed that in openHABian. Add
After=network.target network-online.target
to the [Unit] section of /etc/systemd/system/firemotd.service
and do systemctl daemon-reload; systemctl enable --now firemotd.timer.
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