404 when redirecting in server action with subdomain rewrite rule about next.js HOT 7 OPEN

redirect("../users")

redirect("../../users")

export default async function middleware(req: NextRequest) {
  let host = req.headers.get("host")!;
  let url = new URL(req.url);

 //------------------------------------------------------------
 // Relevant code starts here
 //-----------------------------------------------------------
  
const action = req.headers.get("x-action-redirect");
const forwardedHost = req.headers.get("x-forwarded-host")!;
  if (
    process.env.NODE_ENV === "production" &&
    host == "localhost:3000" &&
    forwardedHost &&
    action
  ) {
    host = forwardedHost;
    url = new URL(action, req.url);
  }

 //------------------------------------------------------------
 // Relevant code ends here
 //-----------------------------------------------------------`

  // Get hostname of request (e.g. demo.vercel.pub, demo.localhost:3000)
  const hostname = getTenantHostname(host);
  const subdomain = getTenantSubdomain(host);

  const searchParams = url.searchParams.toString();
  // Get the pathname of the request (e.g. /, /about, /blog/first-post)
  const path = `${url.pathname}${
    searchParams.length > 0 ? `?${searchParams}` : ""
  }`;

  // Deal with reserved subdomains (e.g. admin.domain.tld)
  if (hostname == `admin.${env.PUBLIC_ROOT_DOMAIN}`) {
    return NextResponse.rewrite(
      new URL(`/admin${path === "/" ? "" : path}`, req.url),
    );
  }

  // Deal with the case when there is NO subdomain; i.e. redirect to a landing page
  if (hostname === "localhost:3000" || hostname === env.PUBLIC_ROOT_DOMAIN) {
    return NextResponse.rewrite(
      new URL(`/home${path === "/" ? "" : path}`, req.url),
    );
  }

  // rewrite everything else to `/[subdomain]/[slug] dynamic route
  return NextResponse.rewrite(new URL(`/${subdomain}${path}`, req.url));
}

export function getTenantHostname(host: string) {
  // host e.g.: calw.localhost:3000, calw.climate-hub.eu, climae-hub.eu, 11---preview.calw.climate-hub.eu

  let hostname = host.replace(".localhost:3000", `.${env.PUBLIC_ROOT_DOMAIN}`); // the "replace only works if there is a subdomain present"

  // Deal with deployment previews
  if (hostname.includes("---preview.")) {
    hostname = `${hostname.split("---preview.")[1]}`;
  }

  return hostname;
}

export function getTenantSubdomain(host: string) {
  const subdomain = getTenantHostname(host);
  return subdomain.replace(`.${env.PUBLIC_ROOT_DOMAIN}`, "");
}