title: Magento product categories disappear when trying to add new subcategory
body: <p>MAGENTO2: All of our categories are showing up in the Magento admin category area but when we try to add a new subcategory, all categories disappear on frontend (top menu). After that, when we re-save all categories one by one they appear again. All of our indexes ("Index Management") are on "UPDATE ON SAVE" mode. 
  Note: 1) Our portal is hosted on AWS. 2) We use RDS db. 3) We use Redis Cache. 4) We use Magento Category Permission Module strategy. </p>