Preconditions (*)

1. PHP 7.4
2. Magento 2.4.3-p1 (also replicated in 2.3.5-p1 and 2.4.2)

Steps to reproduce (*)

1. Override cart item renderer template (Magento_Checkout/cart/item/default.phtml).
2. Add $_item->getChildren() to get child items of configurable products - I am using this to get stock levels for child products when a configurable product is added to the cart. For demo purposes, I have var_dumped $_item->getHasChildren() in the screenshots below.
3. Add enough individual products to the cart to trigger pagination in the cart (by default more than 20 products).
4. Observe that without pagination active, $_item->getHasChildren() returns NULL for simple products, and (bool)true for configurable products. When pagination is triggered, $item->getHasChildren() returns NULL for all products, including configurables with children.

Expected result (*)

var_dump($_item->getHasChildren()) should return (bool)true for configurable products. $_item->getChildren() should also return an Magento\Quote\Model\Quote\Item\AbstractItem array. This screenshot shows it working correctly for a cart where pagination has not been triggered.

Actual result (*)

var_dump($_item->getHasChildren()) actually returns NULL for configurable products. $_item->getChildren() also returns an empty array. This screenshot is taken once enough products have been added to the cart to trigger pagination.

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.