I'm having problems with spotlight too. In system preferences, the search field is not working, it doesn't filter as you type. I have the "Paste" app (clipboard manager) installed and since upgraded to Sonoma the search field doesn't work either. I'm testing other apps. Already re-index everything and still doesn't work.
OZ105
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Same problem here. Things I've already done:
Disabled gatekeeper
Disablde System Integrity Protection (SIP)
Blocked ocsp.apple.com in /etc/hosts
Verified Sharing and Permissions to Read&Write via file info (cmd-i)
Added check to the App in Full Disk Access in Security & Privacy
Still no luck.