So I was trying to use Laravel custom request, following the documentation:

api.php

Route::post('/register-user', [AuthController::class, 'register']);

AuthController.php:

namespace App\Http\Controllers;

use App\Http\Requests\TestRequest;
use Illuminate\Routing\Controller as BaseController;

class AuthController extends BaseController
{
  /**
   * Register a new user
   * @param TestRequest $request
   * @return void
   */
  public function register(TestRequest $request): array
  {
    dd($request);
  }
}

TestRequest.php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class TestRequest extends FormRequest
{
  /**
   * Get the validation rules that apply to the request.
   *
   * @return array<string, mixed>
   */
  public function rules()
  {
    return [
      'name' => 'required|string',
    ];
  }
}

when I make a post request to this route, my $request object is just all empty. as you can see: 

But when I change the TestRequest to just a regular Request, it works normally.

What am I missing using my custom TestRequest?