I recently upgraded to Sonoma and am experiencing a similar issue. I have a Smart Rule which automatically adds a date to a file name, using the string %recordAdditionShortDate%
I had this configured before so that it would spit out “2/15/24” but now the system preferences have it as “2024/02/15”. Will I need to change the global date format through System Settings, or is there some other way that I could format the date as I had it before?