Stumbling upon legacy content in search results is a common headache that hurts...

https://stateofseo.com/should-i-301-redirect-old-urls-or-leave-a-404-the-reality-of-content-decay/

Stumbling upon legacy content in search results is a common headache that hurts your site’s authority. Often caused by outdated server caching, these ghost pages confuse users and dilute your SEO efforts