Cart-Icon-Bubble Issue in Shopify Horizon Theme (Public App Context)

[Eric_Han]

Short description of issue

Cart-Icon-Bubble Issue in Shopify Horizon Theme (Public App Context)

Reproduction steps

Issue Overview
a functional problem when merchants use Shopify’s latest free Horizon theme: When executing the /cart/add.js API operation with specific sections parameters (e.g., sections: “cart-items,cart-icon-bubble,cart-live-region-text,cart-footer”), the returned response lacks any section-related data entirely.

This behavior deviates from expectations, as Shopify’s free themes (including Horizon) are supposed to support section-based cart updates via the /cart/add.js endpoint—consistent with other commonly used free Shopify themes (e.g., Dawn, Sense). In contrast, testing with these other free themes confirms that the same /cart/add.js request with identical sections parameters correctly returns the requested section data (including cart-icon-bubble), enabling normal cart UI sync (e.g., updating item counts in the cart bubble).

Additional info

no

What type of topic is this

General discussion

[Eric_Han]

Here is the params of cart/add.js

for dawn theme ：

for refresh theme

for horizon theme：

for rise theme

as you can see only hozizon theme cannot get the sections， i see this theme change a lot and why？