Cart error "You can only add X amount of this item to your cart"

[eugenekasimov]

Describe the current behavior

There is an cart error "You can only add X amount of this item to your cart" that occurs if you go to the cart from the checkout using breadcrumbs and try to change qty in cart. This error does not reflect an actual inventory of an item. An order of items in the cart may switch when you change qty.

Replication Steps

• Add 2 or more products to the cart
• Go to the cart and then proceed to the checkout
• Use Checkout Breadcrumbs to go back to cart
• Attempt to add/change qty of the products in the cart (Order of products may switch) > ERROR.
• Cart will have the correct number of products if refreshed

Describe the expected behavior

Expected behaviour is being able to correctly navigate back to the cart from the checkout and change the number of products then navigate back to the checkout.

Version information (Dawn, browsers and operating systems)

• Dawn Version: 11.0.0
• Chrome Version 108.0.5359.124
• macOS Version 13.1

Possible solution

Additional context/screenshots

Video

[lucianosousa]

cc @dcugalj do you know if the cart API renders items in the checkout page? We may have another bug here

[dcugalj]

@lucianosousa , this seems to be FE bug, correct?

[lucianosousa]

@lucianosousa , this seems to be FE bug, correct?

@dcugalj not sure, it could be related to how we return the cart object here whenever we have a message coming from the backend.
That's why I think it should be interesting to see this from the cart team perspective

Maybe take a look in what you return when the scenario Eugene's shared happens

[jibeizhao]

looks similar to this one Down theme issue

[austriker27]

I've also come across this bug in another Shopify Theme - so perhaps its a bug in Shopify not the Dawn theme.