Ajax Cart API response item_count bug on cart/change request

[zachmdev]

Describe the current behavior

With a bundle product in the cart, if we change its quantity, or another product's quantity, or simply remove a product from the cart, the response we get from the Ajax Cart API has the wrong item_count value. If you compare item_count and items on the screenshot, it doesn't match.

Describe the expected behavior

The bundle product should count as one product and not as the sum of the products it is composed by.

Version information (Dawn, browsers and operating systems)

• Dawn Version: 15.1.0
• Chrome Version 128.0.6613.138
• macOS Version 14.6.1

Possible solution

We might "bypass" this using the Section rendering API to render the cart.item_count instead of rendering it with Javascript, but this should be fixed anyway.

Additional context/screenshots

This issue is related to that one: #2994 (comment)