Unable to remove product from cart; "Cart item no longer exists or is invalid" error is displayed

[ravichudasama01]

## Summary

Removing a product from the cart does not work as expected on Mercantile. Instead of removing the item, an error notice is displayed stating that the cart item no longer exists or is invalid.

## Steps to Reproduce

1. Visit ​https://mercantile.wordpress.org/
2. Add any product to the cart.
3. Open the cart sidebar.
4. Click the remove/delete (trash can) icon for the cart item.

## Expected Result

• The selected item is removed from the cart.
• The cart item count updates accordingly.
• No error message is displayed.

## Actual Result

• The item remains in the cart.
• The cart count is unchanged.
• The following error message is displayed:

Cart item no longer exists or is invalid.