WordPress Page Add Custom Endpoint

Hi
i use this code to add custom endpoint for page, but in wordpress 5.5 not working and remove_action(‘template_redirect’, ‘redirect_canonical’); return 404.

    // custom variables will only be available on fix page.
    $pageslug = 'fix';

    // get the actual request and parse it down
    if (isset($wp->request) && strpos($wp->request, '/')) {
        $requests = explode('/', $wp->request);

        // array_shift takes out the first path what is the page slug/name.
        // and make sure it's the popular page.
        if ($pageslug == array_shift($requests)) {
            // set pagename to make sure we have found a page with the name.
            $wp->set_query_var('pagename', $pageslug);

            // wordpress automatically try to check if it's an attachment when a parameter is present
            // after pageslug, so we set it false as we do the parsing ourselves.
            $wp->set_query_var('attachment', false);

            // we understand this is a valid page, and let WordPress understand there's no error.
            $wp->set_query_var('error', false);

            $count = count($requests);

            if ($count > 0) {
                // stop the canonical redirection, if a url request isn't same as get_permalink( ) or
                // the_permalink( ), then wordpress redirects it to the actual page
                // and removes all parameter after slug name.
                remove_action('template_redirect', 'redirect_canonical');

                foreach ($requests as $i => $request) {
                    // this should be the key, and next one will be the value
                    if ($i == 0 || $i % 2 == 0) {
                        if (isset($requests[$i + 1]))
                            $val = $requests[$i + 1];
                        else
                            $val = '';
                        $wp->set_query_var('fix', $val);
                    }
                }
            }
        }
    }