Apple Mail: Searches are not returning results of emails that exist

The results return nothing when searching Apple Mail Version 16.0 (3731.700.6). I have tested this with a range of 1 through several hundred emails that I would expect to yield a return. Even when I select a SINGLE email address, there are no results. In addition, smart mailboxes are no longer capturing emails. The ones it does capture are not de-notified. The notification remains. I have tried shutting down my iMac and rebooting, but no change in status. This issue started happening as of 01/24/2024 on my iMac Ventura OSX Version 13.6.3 (22G436). My desktop IS NOT eligible for an upgrade to Sonoma.

The issue does not occur on my MacBook Air (Sonoma 14.2.1)