my Mac says I have an unread message, but I don't
This happens pretty frequently. Clicking on Mac Messages (Sonoma 14.7.2) in the dock, I am informed that "35213 (1 unread)". Duh? None of my messages are unread, nor are they unread on my iPhone. In Messages, I select View->Unread Messages, and none appear. I sync iCloud, and that message still appears. I kill the app and restart it, and the message still appears.
What is Messages trying to tell me? What is 35213?
iMac 24″, macOS 14.7