Show 404 option not working correctly.

When selecting the option:

Issue a Page Not Found (404) error for feed requests

… a request for https://domain.com/feed/ renders the view:source of the 404 page, as if it’s parsed with <pre> tags. It does not render the template.

The other redirect option does work as advertised.

I would suggest a modification to the else condition on lines 134’ish by changing:

else {
    $wp_query->is_feed = false;
    $wp_query->set_404();
    status_header( 404 );
}

to:

else {
    $wp_query->is_feed = false;
    $wp_query->set_404();
    status_header( 404 );
    wp_redirect(home_url('404'), 302);
    exit();
}

Works by forwarding the user requesting domain.com/feed/ to domain.com/404 – ideally it should 404 without the URL rewrite, but for now this should work with most WP installs.

Hope this helps others.

https://www.ads-software.com/plugins/disable-feeds/