Minor (I think) bug during todays firmware update

This morning upon upgrading my server, I got this.

==> Initcpio image generation successful
(3/4) Check if user should be informed about rebooting after certain system package upgrades.
==> INFO: Reboot is recommended due to the upgrade of core system package(s).
error: command failed to execute correctly
(4/4) Checking which packages need to be rebuilt

I execute this remotely via ssh, could the error be unable to trigger a graphical ‘reboot required’?

You need to show us the full mkinitcpio log rather than just a snippet of “error: this didn’t work”

It appears (journalctl) to be a core dump in dunst, which goes along with my assumption. Possibly triggered by installing (then removing) i3…before update. It may not reoccur after reboot (we’ll see).
Post note: Removed dunst, as I3 was a total mistake…suspect that will fix the issue. So not really a bug, just an accidental relic.
I wasn’t aware that there was a mkinitcpio log produced? Where?