Hi @samcleathero. Thank you for your report.
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@magento give me 2.4-develop instance with extensions samcleathero/m2-item-render-test

Edit: this doesn't seem to have worked as I thought it would - hopefully somebody can take a look and figure out what I was trying to achieve!

Hi @samcleathero. Thank you for your request. I'm working on Magento instance for you.

Hi @samcleathero, here is your Magento Instance: https://b26a589b00d5c9d782886b45dab65007-2-4-develop.instances.magento-community.engineering
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Hi @engcom-Hotel. Thank you for working on this issue.
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The bug is in vendor/magento/module-checkout/Block/Cart/Grid.php.
See \Magento\Checkout\Block\Cart\Grid::getItems(), let's say the quote includes only configurable products:

1. if no pagination: parent::getItems() returns $this->getQuote()->getAllVisibleItems(), where

• first, all quote items are loaded: configurable (parent_item_id is null) and child simples (parent_item_id is not null)
• note, in \Magento\Quote\Model\ResourceModel\Quote\Item\Collection::_afterLoad() child quote items are assigned to the parent quote items
• then in getAllVisibleItems() all children are not included in the result array, but child quote items are still linked to the parents - items in the result.

2. if there is a pagination:

• getItemsForGrid() is used, and it builds a query originally without children:
  $itemCollection->addFieldToFilter('parent_item_id', ['null' => true]);
• This condition is important here since the correct page should be retrieved
• Since the current page is loaded by SQL means (OFFSET, LIMIT), that's why non-visible quote items should be skipped in SQL query (see \Magento\Checkout\Block\Cart\Grid::_prepareLayout(), $pager in setCollection() sets current page number and page size)
• Then the children are not linked to their parents afterwards, and as result - there is a bug.

As a possible solution I would suggest to add a custom quote items collection for pagination case.
It will be returned in getItemsForGrid().
That collection in its _afterLoad() loads again all quote items (or children only), and attaches children to parents.

Hi @samcleathero,

Thank you for reporting the issue.

We are successfully able to reproduce it on Magento 2.4-develop.

Steps followed to reproduce issue:

1. Added configurable and non-configurable products to the cart.

2. Print the $_item->getHasChildren() property on the $_items.

3. Observe the function output with pagination and without pagination for the cart.

4. $_item->getHasChildren() returns true when the pagination is not there for the cart and returns null when the cart is with pagination. (See the attached screenshots)

Conclusion: Item property should not change before and after pagination applied to the cart items.

Thanks

✅ Jira issue https://jira.corp.magento.com/browse/AC-1735 is successfully created for this GitHub issue.

✅ Confirmed by @engcom-Hotel. Thank you for verifying the issue.
Issue Available: @engcom-Hotel, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

@magento I am working on this

@magento,

I can confirm this is still an issue in 2.4.6, created a pull request to Magento with a solution.

Until this has been solved, you can use the following patch

Index: vendor/magento/module-checkout/Block/Cart/Grid.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/vendor/magento/module-checkout/Block/Cart/Grid.php b/vendor/magento/module-checkout/Block/Cart/Grid.php
--- a/vendor/magento/module-checkout/Block/Cart/Grid.php
+++ b/vendor/magento/module-checkout/Block/Cart/Grid.php
@@ -117,12 +117,41 @@
             $pager = $this->getLayout()->createBlock(\Magento\Theme\Block\Html\Pager::class);
             $pager->setAvailableLimit([$availableLimit => $availableLimit])->setCollection($itemsCollection);
             $this->setChild('pager', $pager);
+            $this->updateCollectionWithQuoteItems($itemsCollection);
             $itemsCollection->load();
             $this->prepareItemUrls();
         }
         return $this;
     }

+    /**
+     * @param \Magento\Quote\Model\ResourceModel\Quote\Item\Collection $itemsCollection
+     *
+     * @return \Magento\Quote\Model\ResourceModel\Quote\Item\Collection
+     */
+    private function updateCollectionWithQuoteItems(
+        \Magento\Quote\Model\ResourceModel\Quote\Item\Collection $itemsCollection
+    ) {
+        foreach ($itemsCollection->getItems() as $key => $collectionItem) {
+            $quote      = $this->getQuote();
+            $quoteItems = $quote->getItems();
+            foreach ($quoteItems as $quoteItem) {
+                if ($quoteItem->getSku() === $collectionItem->getSku()) {
+                    $itemsCollection->removeItemByKey($key);
+                    try {
+                        $itemsCollection->addItem($quoteItem);
+                    } catch (\Exception $e) {
+                        // No action, item id removed
+                    }
+
+                    break;
+                }
+            }
+        }
+
+        return $itemsCollection;
+    }
+
     /**
      * Prepare quote items collection for pager
      *