I've got a Calendar page with a bunch of sub-pages for regions. I went in to clean up the sub-page slugs for SEO and better User Experience - more readable and meaningful URLs.

But then when I went to edit the Intro text on the page to link to the new URLs, the pop-up menu of subpages on the parent calendar page still used the original slugs, not the updated ones, even after reloading.

I guess you'd call this a bug.