title: Magento 2 2.3 Full Page Cart issue
body: <p>Is currently working on a new M2 2.3 site to replace my M1.
  Almost done but I have found an issue with the cart and full page cache.</p>
  
  <p>When full page cache is enable and I add a product to cart its all good. But when I move to another category and add another product the cart gets empty and start all over again.</p>
  
  <p>If I disable the full page cache the cart works fine.</p>
  
  <p>Anyone have an idea of what i might be?</p>
  
  <p>The site is still in devolopment.</p>