title: Magento 2 - getCollection returns only simple products
body: <p>I'm trying to get all the products. I'm doing this way:</p>
  
  <pre><code>$objectManager-&gt;get('Magento\Catalog\Model\Product')
              -&gt;getCollection()
              -&gt;addAttributeToSelect('*');
  </code></pre>
  
  <p>But only simple products are returned. </p>
  
  <p>Getting the NOT RETURNED products by sku works fine:</p>
  
  <pre><code>$p = $objectManager-&gt;create('\Magento\Catalog\Model\ProductRepository')-&gt;get($sku);
  </code></pre>
  
  <p>Any idea?
  Thanks in advance.</p>
  
  <p>--
  Magento version 2.2.0</p>