Custom submit handler never gets called

I want to check a data when an user submits a form. I set a custom submit handler in form alter, but my custom handler function never gets called. I don’t understand why.

This is my code :

/**
 * Implements hook_form_alter().
 */
function custommodule_form_alter(&$form, DrupalCoreFormFormStateInterface $form_state, $form_id)
{
    if($form_id == "node_test_form") {
        kint("toto"); //toto is displayed when I load the form page
        $form_state->setSubmitHandlers(array("_custommodule_test"));
    }
}

function _custommodule_test(&$form, DrupalCoreFormFormStateInterface $form_state){
    kint("mwahahaa?"); // never displayed
    die(); // doesn't work, the submit form page loaded successfully
}

I cleared cache, but the issue is still there.

Edit ##

I tested add a validate handler, the problem persists.. The code :

/**
 * Implements hook_form_alter().
 */
function custommodule_form_alter(&$form, DrupalCoreFormFormStateInterface $form_state, $form_id)
{
    if($form_id == "node_test_form") {
        kint("toto"); //toto is displayed when I load the form page
        $form_state->setSubmitHandlers(array("custommodule_myform_mysubmit"));
        $form_state->setValidateHandlers(array("custommodule_myform_myvalidate"));
        $form_state->getSubmitHandlers(); // display array("custommodule_myform_mysubmit")
        $form_state->getValidateHandlers(); // display array("custommodule_myform_myvalidate")
    }
}

function custommodule_myform_mysubmit(&$form, DrupalCoreFormFormStateInterface $form_state){
    kint("submit ?"); // never displayed
    die(); // doesn't work, the submit form page loaded successfully
}

function ccustommodule_myform_myvalidate(&$form, DrupalCoreFormFormStateInterface $form_state){
    kint("Validate ?"); // never displayed
    die(); // doesn't work, the submit form page loaded successfully
}
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