From what I can see in your screenshot, you are trying to access a resource that is not available (404) and then WordPress is performing the redirection (or displaying that page). This not wrong but the expected behaviour, and that is the reason why the console log contains an error message.
As you an see the browser talks to the 'localhost' ok and displays the blog but no Login.
As per the Login button, this is related to the default theme included by WordPress 5.6 itself (which may not include it). You should contact the developer of the theme (WordPress) for any related doubts.
Clearly this software has not been testes properly
We value your feedback, but just to let you know we do perform a series of tests in order to exhaustive validate all of our assets before releasing.
Jose Antonio Carmona
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