How to persist webform validation result in multistep ajax webform handler?

In my AJAX form the user has to do a validation as he needs a code to enter the rest of the form (it has 3 pages or more). I have an handler to validate this and this same handler uses that code to do get a node:

  // ON the handler validate()
  $code_valid= $this->sessionManager->get('code_valid');
  
  if (empty($code_valid))
  {
     $this->handlerProperty = $this->contentService->getContentByCodeAndCurrentNodeId($node_id, $name, $code);
     $this->sessionManager->set('code_valid', $this->handlerProperty);
  }


  // On repository Class
  public function getContentByCodeAndCurrentNodeId(int $node_id, string $name, string $code)
  {
    return $this->entityTypeManager->getStorage('node')
      ->loadByProperties([
        'type' => 'XXXXX',
        'event' => $node_id,
        'name' => $name,
        'code' => $code,
      ]);
  }

  public function confirmForm(array &$form, FormStateInterface $form_state, WebformSubmissionInterface $webform_submission) {
     //If submissions is successful, delete private store
     $this->sessionManager->delete('code_valid');
  }

My problem is that there's no way to $this->sessionManager->delete('code_valid') if the user leaves amidst the form. So I was looking for a way to persist the validation result, without resorting to sessionManager/privatestoremanager.

If you want more context the webform is setup to be used on a specific content type (A). It's used to create/update/delete another content type (B). It's a one to many relationship between them so this form will create multiple B dynamically, depending on the form content submitted - it can create up to 5 of B. The first step is a validation/auth to be able to use the "real" form (next steps after first).

Thanks in advance!