Siri in CarPlay reports phantom new message with picture

I'm using iPhone 16 Pro running IOS 27.2. This issue is about using Siri in CarPlay when reading Messages. When using CarPlay, Siri reads my messages and allows me to respond. However, along with my actual messages, Siri reports that there is a "new" message from one of my contacts with a picture (no text) and asks me if I want to reply. I have searched my iPhone for this unread message, but do not find it. I have also tried replying to the message in the hope that replying would mark it as read. That hasn't worked. I have restarted my iPhone, but the "new" message keeps being mentioned by Siri in CarPlay (but nowhere else). How can I make this bogus "new" message go away when using Siri in CarPlay?