Action Controller@store not defined in laravel 8 for laravel collective even after setting namespace except I use full route

Question

I'm using Laravel 8 for a new project and trying to use the laravel collective form helper. I want to submit to a method from my 'TransactionsController' from a form in my view.

However, when I try to open up the view so I can enter form values, I get action TransactionsController@store not defined although the controller and method exists and all. The page loads when I do the full route, as in: 'App\Http\Controllers\TransactionsController@store' in {!! Form::open(['action' => 'App\Http\Controllers\TransactionsController@store', 'method' => 'POST']) !!}, but when I set namespace to 'App\Http\Controllers' in RouteServiceProvider and do {!! Form::open(['action' => 'TransactionsController@store', 'method' => 'POST']) !!} , I get action 'App\Http\Controllers\TransactionsController@store' not defined. I don't get it.

Isn't it the same thing? What am I missing? How can I fix this and use {!! Form::open(['action' => 'TransactionsController@store', 'method' => 'POST']) !!} without getting that error? Thanks.

View (in a file named seller.blade.php)

...
{!! Form::open(['action' => 'TransactionsController@store', 'method' => 'POST']) !!}

    //Form groups and form elements

    {{Form::submit('Submit', ['class' => 'btn btn-primary'])}}
{!! Form::close() !!}  

Route

use Illuminate\Support\Facades\Route;
use App\Http\Controllers\PagesController;
use App\Http\Controllers\TransactionsController;

Route::get('/', [PagesController::class, 'index']);

Route::get('/buyer', [PagesController::class, 'buyer']);

Route::get('/seller', [PagesController::class, 'seller']);

Route::get('/faqs', [PagesController::class, 'faqs']);

Route::get('/contact', [PagesController::class, 'contact']);

Route::resource('transactions', TransactionsController::class);

TransactionsController

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Transaction;

class TransactionsController extends Controller
{

    public function index()
    {
        $transactions = Transaction::all();
        return view('transactions.index')->with('transactions', $transactions);
    }

    public function create()
    {
        //
    }

    public function store(Request $request)
    {
       //some form validations
    }

    public function show($id)
    {
        
    }

    public function edit($id)
    {
        //
    }


    public function update(Request $request, $id)
    {
        //
    }

   
    public function destroy($id)
    {
        //
    }
}

RouteServiceProvider

namespace App\Providers;

use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Support\Facades\Route;

class RouteServiceProvider extends ServiceProvider
{
    /**
     * The path to the "home" route for your application.
     *
     * This is used by Laravel authentication to redirect users after login.
     *
     * @var string
     */
    public const HOME = '/home';

    /**
     * The controller namespace for the application.
     *
     * When present, controller route declarations will automatically be prefixed with this namespace.
     *
     * @var string|null
     */
    protected $namespace = 'App\Http\Controllers';

    /**
     * Define your route model bindings, pattern filters, etc.
     *
     * @return void
     */
    public function boot()
    {
        $this->configureRateLimiting();

        $this->routes(function () {
            Route::prefix('api')
                ->middleware('api')
                ->namespace($this->namespace)
                ->group(base_path('routes/api.php'));

            Route::middleware('web')
                ->namespace($this->namespace)
                ->group(base_path('routes/web.php'));
        });
    }

    /**
     * Configure the rate limiters for the application.
     *
     * @return void
     */
    protected function configureRateLimiting()
    {
        RateLimiter::for('api', function (Request $request) {
            return Limit::perMinute(60);
        });
    }
}

If it helps, I also get this when I try to run route:list

1    [internal]:0
      Illuminate\Foundation\Console\RouteListCommand::Illuminate\Foundation\Console\{closure}(Object(Illuminate\Routing\Route))

2   C:\wamp64\www\sbgi\vendor\laravel\framework\src\Illuminate\Container\Container.php:809
      ReflectionException::("Class App\Http\Controllers\App\Http\Controllers\TransactionsController does not exist")