/shoppingcart/productdetails_attributechange problem

Hi Everybody
I'm using NopCommerce 3.9. Analizing Google Search Console i can see that to much resources was blocked because url

<mydomain>/shoppingcart/productdetails_attributechange?productId=419&validateAttributeConditions=False&loadPicture=True

is natively blocked by default.Infact inside robots.txt there is a rule

Disallow: /shoppingcart/*

that block above url. So i added

Allow: /shoppingcart/productdetails_attributechange*

inside file robots but now i have many 404 errors because some urls like:

<mydomain>/shoppingcart/productdetails_attributechange?productId=419&validateAttributeConditions=False&loadPicture=True

doesn't exist anymore. Which is best way to solve this problem ?

Thanks in advance