Does not look like an installation bug. I see similar entries in journalctl as far back as October on f40 so whatever is the cause seems a discrepancy between the kernel installation and systemd-logind.
It is a notification and not something that interferes with booting or operation so you can choose to ignore it or choose to file a bug report against the systemd-logind process.
I know of no reason for systemd-logind to access the files under /boot/loader/entries which seems to be where those messages originate.
It is not logical that system-logind should even access the bls files, but apparently it does. It can be prevented by not flagging the /boot partition as an
extended boot partition aka bls_boot in gparted.
If you run bootctl, you will see the same messages.
$ sudo bootctl
systemd-boot not installed in ESP.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.6-300.fc42.x86_64.conf:6: Unknown line 'grub_users', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.6-300.fc42.x86_64.conf:7: Unknown line 'grub_arg', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.6-300.fc42.x86_64.conf:8: Unknown line 'grub_class', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-0-rescue.conf:6: Unknown line 'grub_users', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-0-rescue.conf:7: Unknown line 'grub_arg', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-0-rescue.conf:8: Unknown line 'grub_class', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.9-300.fc42.x86_64.conf:6: Unknown line 'grub_users', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.9-300.fc42.x86_64.conf:7: Unknown line 'grub_arg', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.9-300.fc42.x86_64.conf:8: Unknown line 'grub_class', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.8-300.fc42.x86_64.conf:6: Unknown line 'grub_users', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.8-300.fc42.x86_64.conf:7: Unknown line 'grub_arg', ignoring.
/boot/loader/entries/6155ccc2fb9d46c2b22a63ad1080ece5-6.14.8-300.fc42.x86_64.conf:8: Unknown line 'grub_class', ignoring.