How to remove the redirect and fix the 404 error?

Question

WordPress

Created a page named my-page. Then I created a post called my-page-is-best. After the link of the page, my-page became my-page-is-best/my-page/ and when you go, it gives a 404 error. How to fix this? I looked at the redicts in plugins. I looked for such a link in the database and did not find it. I installed the Disable URL Autocorrect Guessing plugin - it did not help. Added to function –
remove_filter('template_redirect', 'redirect_canonical'); - didn't help either. What could it be? And how to fix it?

Answer 1

The problem was in the Yoast SEO plugin. He cached. After clearing the cache. A day later everything was ok.

Answer 2

The good old WP debug will help you - disable all plugins and put the default twenty theme. Check that everything is working properly and start turning everything on in turn, this way you will find the culprit