Child Product stock is assigned in other stock source and product page show out of stock item

[ananth-iyer]

Preconditions (*)

1. Magento - 2.4.8-p3
2. magento/inventory-metapackage - 1.2.8-p3
3. PHP 8.3

Steps to reproduce (*)

1. First create 4 websites then create MSI source and create stock
2. Create a new configurable product in non-default website scope
3. In child products, assign stock to non-default source. Do not use default source.
4. Open product in new website. it will show options out of stock status
5. The default stock id should not be used in all products.
6. Issue found in vendor/magento/module-inventory-catalog/Plugin/InventoryIndexer/Model/ResourceModel/GetBulkLegacyStockStatusDataFromStockRegistry.php
7. On line, if ($this->defaultStockProvider->getId() === $stockId) { - if it not default stock id then skips and $results is empty so $originalResults data is not considered.
8. It returns empty & wrong data

Expected result (*)

1. $results is empty then it should consider $originalResults

Actual result (*)

1. Child items show FALSE POSITIVE - out of stock status. Although there are in stock.

Thank you.

[m2-assistant]

Hi @ananth-iyer. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.
Add a comment to assign the issue: @magento I am working on this

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[ananth-iyer]

@magento I am working on this

[ananth-iyer]

Additional finding is \Magento\InventoryCatalog\Model\DefaultStockProvider is hard-coded to return stock id 1 and it is not based on the current website.