Error after upgrading from beta1 to beta2

Same problem detected!

My tests found the problem appear when I use "with('message', 'OK')" method in "return redirect()->back()" object;

I've manual install a new clean app and only change $baseURL on App config.

'Session' service and 'form' helper are enabled on BaseController.

PHP Code:

<?php namespace App\Controllers;

class Home extends BaseController
{
    
    public function index()
    {
        return view('welcome_message');
    }


    public function test()
    {
        if ($this->request->getMethod() === 'post')
        {
            //return redirect()->back(); GOOD
            return redirect()->back()->with('message', 'OK'); //BAD
        }

        return view('test');
    }

} 


PHP Code:

<?= form_open() ?>
    <?= form_input(['type' => 'text', 'name' => 'input']) ?>
    <?= form_button(['type' =>'submit', 'content' => 'Submit']) ?>
<?= form_close() ?>