MRC and NRC prices in product configurator for Modify Order

On the 8.1.1.6 vanilla application when you modify an asset then in product configurator the Non Recurring Charge (NRC) is not calculated and updated when you add NRC components but the Monthly Recurring Charge (MRC) is updated when you add MRC components. For a new sales order both the MRC and NRC are updated correctly in product configurator for the same product definition. Is this a product defect or the expected behaviour?

 

Also when you select Done for a Modify Order the MRC subtotal on the root product line item is a total of all the MRC components for all action codes. However the NRC subtotal on the root product line item is a total of only the NRC components with action code “Add”. Is this expect behaviour ?