Nav suddenly linking to 2 old pages, 404 error. Even rebuilt the nav and getting same issue. So glitchy! Any advice?

Had a client report this issue: 2 pages in dropdown menu suddenly linking to old pages and even old slugs that don’t exist anymore, resulting in 404 errors. Re-linking, renaming, even rebuilding the menu completely not working. Any ideas?

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Make sure there are no automatic redirects created under the 301 URL Redirect Manager in your site’s dashboard that may be pointing to these old slugs.