useSession doesn't get session in TanStack Start

export const auth = betterAuth({
  basePath: "/auth",
  database: drizzleAdapter(db, {
    provider: "pg",
    usePlural: true,
  }),
  trustedOrigins: [...],
  plugins: [...
    reactStartCookies(),
  ],
});

const signInMutation = useMutation({
    mutationFn: async (data: z.infer<typeof signInSchema>) => {
      return await auth.signIn.email({
        email: data.email,
        password: data.password,
      });
    },
    onSuccess: (data) => {
      toast.success("Signed in successfully");
      // biome-ignore lint/style/noNonNullAssertion: <explanation>
      localStorage.setItem("auth-token", data.data?.token!);
      navigate({ to: "/app" });
    },
    onError: (error) => {
      toast.error(error.message || "Failed to sign in. Please try again.");
    },
  });

export const Route = createFileRoute("/app")({
  beforeLoad: async ({ context }) => {
    const { data, error } = await context.auth.getSession();
    console.log("data", data);
    if (
      error ||
      data === null ||
      data?.session === null ||
      data?.user === null
    ) {
      throw redirect({ to: "/auth/sign-in" });
    }
    return {
      user: data.user,
      session: data.session,
    };
  },
  component: RouteComponent,
});