Problem: A particular SharePoint site's Home page URL leads to 404 page not found error. While all other pages were working without any issues, On hitting the Home page URL, observed its redirecting to some other URL which doesn't exists!
After an hour, found the problem. Actually user has placed a content editor web part and set the "content link" as an external web site's URL. That external web site URL was redirecting to some other URL on page load, which altered the actual SharePoint site URL. See the screen above:
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