Hmm.. I just tried this code just for test creation of an article. I just been led to the frontpage when triggering the auto action and no article is created and no error message - any ideas ?
Code:
$newapp = Factory::getApplication();
$mvcFactory = $newapp->bootComponent('com_content')->getMVCFactory();
$articleModel = $mvcFactory->createModel('Article', 'Administrator', ['ignore_request' => true]);
$article = [
   'catid' => 8,
   'alias' => 'tttttttttttttttt44',
   'title' => '123My Article Title 44',
   'introtext' => 'My Article Intro Text',
   'fulltext' => 'My Article Full Text',
   'created_by' = '618',
   'state' => 1,
   'attribs' = '{"article_layout":"","show_title":"","link_titles":"","show_tags":"","show_intro":"","info_block_position":"","info_block_show_title":"","show_category":"","link_category":"","show_parent_category":"","link_parent_category":"","show_associations":"","show_author":"","link_author":"","show_create_date":"","show_modify_date":"","show_publish_date":"","show_item_navigation":"","show_icons":"","show_print_icon":"","show_email_icon":"","show_vote":"","show_hits":"","show_noauth":"","urls_position":"","alternative_readmore":"","article_page_title":"","show_publishing_options":"","show_article_options":"","show_urls_images_backend":"","show_urls_images_frontend":""}',
  'metadata' = '{"robots":"","author":"","rights":"","xreference":""}',
   'language' => '*',
];
if (!$articleModel->save($article)){
   throw new Exception($articleModel->getError());
}