Form validation - Always false?

I have a very basic form with a controller that looks like this:
class Home extends BaseController

PHP Code:

{
    public function index()
    {
        helper(['form', 'url']);
        if (!$this->validate([

            'naam' => 'required'
        
        ])) {        
            echo view('form', [
                'validation' => $this->validator,
            ]);
        } else {
            echo "success!";
        }
    }
} 


The view has a section at the top for showing the errors:

PHP Code:

<?php if($validation->listErrors()) {?>
  <div class="alert alert-info" role="alert">
Please check the marked fields
</div>
<?php } ?>
</div> 


For some reason the validation is always triggered and I can't figure out why. Should you use seperate functions in CI4?