This screensaver bug is happening still to me. I have 2 iMacs running Ventura 13.3.1 and both screensaver options only work with very few of builtin screensavers. Although my bigger 27inch iMac finds the Photos eventually but the 21 inch iMac never finds them. Neither will will work using Aerial screensaver. Aerial Screensaver will only work with main screen only with secondary screen disconnected, but it used to work before Ventura without any issues.
SteveLeo56
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Bonbeach, VIC