This happened today, where the AI Summary source has an incorrect URL. The article exists, but the URL is incorrect.
When I click on Add React Components to Banner, the URL in the summary is: https://success.vanillaforums.com/articles/add-react-components-to-banner
In the sources the correct URL is: https://success.vanillaforums.com/kb/articles/391-add-react-components-to-banner