I am using AuthJS with middleware that directs the user to home if they're already logged in. If I have a session on one window but on another tab stay on the login screen, and then try to log in I hit that redirect when I click the login button (since I have a valid session) and in the app router server logs I see the /home page is requested, but my browser never navigates there in response to the redirect. This redirect works in other scenarios, except in this server action driven login edge case.

Relevant code:

"use client";

export default function LoginForm({ isMobileApp, ipAddress }: { isMobileApp: boolean, ipAddress: string | null }) {
  const [loginResponse, action] = useActionState(loginAction, undefined);
  
  return (
      <form
        onSubmit={(e: any) => {
          e.preventDefault();
          startTransition(() => action(new FormData(e.target)));
        }}
        action={action}
      >
        <button
          onClick={() => {
            triggerHaptic();
          }}
        >
          Login
        </button>
      </form>
   )

export async function loginAction(prevState: string | undefined, formData: FormData) {
  console.log("loginAction"); // This is never hit during the second login with an existing session because it's intercepted by the auth callback

  try {
    await signIn("credentials", { action: "login", ...Object.fromEntries(formData), redirect: false });
  } catch (error: any) {
    console.log(error);
    if (error.type === "CredentialsSignin") {
      return "CredentialSignin";
    }

    return "UnknownError";
  }

  if (formData.get("isMobile") === "true") {
    redirect("/mobile");
  } else {
    redirect("/");
  }
}

// authjs config
  callbacks: {
    authorized({ auth, request: { nextUrl } }) {
      const isLoggedIn = !!auth?.user;

      // If the mobile app is already logged in take them to home
      if ((nextUrl.pathname.startsWith("/mobile/onboard") || nextUrl.pathname.startsWith("/mobile/onboard/login"))) {
        // This path hits and returns Response.redirect
        if (isLoggedIn) return Response.redirect(new URL("/mobile", nextUrl));
      }

      return true;
    },