https://wiki.archlinux.org/title/pacman/Pacnew_and_Pacsave
It’s also in announcements:
With polkit 124-1 there were changes made to etc/pam.d/polkit-1. So check if you made local changes to the file. See also: ropid comments on Today’s update moved polkit-1 to polkit-1.pacsave without providing a new config
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