As previously announced, execute order 66: https://lists.freedesktop.org/archives/systemd-devel/2022-September/048352.html The meson options split-usr, rootlibdir and rootprefix become no-ops that print a warning if they are set to anything other than the default values. We can remove them in a future release.
These unit (if enabled) will try to update the OS in regular intervals. Moreover, every day in the early morning this will attempt to reboot the system if there's a newer version installed than running.