thinkphp8 session获取失败

1.登录时创建sesion,存入user_id

<?php
namespace app\controller;

use think\annotation\route\Route;
use app\BaseController;
use think\facade\Log;
use think\facade\Request;
use app\model\UserModel;

class UserController extends BaseController
{
    //创建userModel对象
    protected $userModel;

    public function __construct(UserModel $userModel)
    {
        $this->userModel = $userModel;
    }
    #[Route('POST','user/login')]
    public function login()
    {
        try {
            $username = Request::param('username');
            $password = Request::param('password');
            $user = $this->userModel->login($username, $password);
            if ($user != null) {
                session('user_id',$user['user_id']);
                return json(['code' => 0, 'msg' => '登录成功','session'=>session('user_id')]);
            } else
                return json(['code' => -1, 'msg' => '用户名或密码错误']);
        } catch (\Exception $e) {
            return json(['error' => $e->getMessage()]);
        }
    }

    //创建对象
  public function create()
    {
        try {

            $userId = session('user_id');
            $sessionData = session();
            Log::info('Session data:', $sessionData);
            $data = [
                'login_name' => Request::param('loginName'),
                'name' => Request::param('name'),
                'password' => md5(Request::param('password')),
                'email' => Request::param('email'),
                //从session获取是谁登录创建了新对象
                'operator_id' => $userId
            ];
            $result = $this->userModel->createUser($data);
            if ($result) {
                return json(['success' => true,'session'=>$userId]);
            } else {
                return json(['success' => false, 'message' => 'Failed to add user','session'=>$userId]);
            }
        } catch (\Exception $e) {
            return json(['error' => $e->getMessage()]);
        }
    }

2.app/middleware.php文件中已经解除了Session初始化的注释,登录功能运行之后runtime/session目录下生成新的session文件，存储内容为登录时的user_id。当运行create()方法时无法获取到session中存储的user_id。