title: WooCommerce product categories are not displayed properly in menu
body: <p>I got this strange behavior in Wordpress, I have about 90 product categories/subcategories.</p>
  
  <p>All the related functions are working fine, except when I go to Appearance -> Menu and try to add product categories to my menu.</p>
  
  <p>The thing is that only two pages of product categories are viewed with many missing categories.</p>
  
  <p>please see the attached screenshot.</p>
  
  <p><a href="https://i.stack.imgur.com/rdcOG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rdcOG.png" alt="Missing subcategories in product category menu"></a></p>
  
  <p>I am using Woocommerce v3.3.4</p>
  
  <p>Server info:</p>
  
  <p><a href="https://i.stack.imgur.com/OC5Wp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OC5Wp.png" alt="Woocommerce Server status"></a></p>