Message "The unit file, source configuration file or drop-ins of plexmediaserver.service changed on disk" After Every Reboot

Ownership and permissions appear correct. Here is the ls -l output…

-rw-r–r-- 1 root root 10 Feb 22 19:50 override.conf

I did a new install of PMS on a fresh Buster image on another Raspberry Pi 4B. If I leave the ‘plex’ user id alone and just create an override.conf with nothing in it (literally an empty file), I still get this warning on reboot. If I remove the override.conf file, I don’t get the warning after a reboot.

I found another thread from August, 2020 where the person also reported this issue but he had other problems and I didn’t see where this particular warning was specifically addressed.

Are you saying this is an OS issue and nothing specifically to do with the plexmediaserver service?