Embedding view in form breaks ajax
You can remove the rendering, you don't need it:

$the_view = views_embed_view('images', 'page_1');
$form['newthing'] = $the_view;


In fact, you should not render yourself in D8. And if you have the rare case you need to do this, read this first:

https://www.drupal.org/node/2513810