nopCommerce version: 4.30
Steps to reproduce the problem:
Step 1: Place 1 Order (3 Product)
Step 2: Login with admin
Step 3: Go to Admin => Sales => Order
Step 4: Click on View button of placed order
Step 5: Go to Products panel on order edit page.
Step 6: Delete 1 product from product list
Step 7: Click on refresh browser
Step 8: Click on Continue button
https://prnt.sc/vpknqu
