2.1.11] Add to cart, try to checkout, cart is empty but mini-cart has items. · Issue #13427 · magento/magento2 · GitHub
Magento: How to check shopping cart empty magento 2? - YouTube
Mini cart doesn't show the products added to cart.... - Magento Forums
Shopping cart is empty after adding simple product if another product was removed from Multiple Addresses checkout before · Issue #30259 · magento/magento2 · GitHub