lw1 This is not really a proper bug, but more something incorrect on the kagi.com site. I randomly stumbled across https://kagi.com/sitemap.xml (I wanted to look at a random sitemap and kagi was the first thing to come to my mind). If I understand https://developers.google.com/search/docs/crawling-indexing/sitemaps/large-sitemaps correctly, the syntax you are using is for linking to other sitemaps and not for specifying pages in the sitemap itself.
danbulant The correct syntax is to use <urlset><url><loc>https://kagi.com/about</loc></url>/</urlset>. As OP said, the current syntax is for specifying sub-sitemaps - but the pages linked are not sitemaps but pages themselves.
