Stock status and saleable qty is not update when updating a product with qty 0

[codebase-md]

Preconditions (*)

1. Magento Inventory 1.2.3(most recent versions seem to contain the same logic as well)
2. No Backorders enabled

Steps to reproduce (*)

1. Update a product with qty = 0 and stock_status 'out of stock'

Expected result (*)

1. Stock status should switch to 'in stock' and saleable qty should be equal to qty

Actual result (*)

1. Stock status is not updated and saleable qty stays 0

Additional Information

I debugged the whole process and found following:

Order of execution

1. \Magento\Inventory\Model\SourceItem\Command\SourceItemsSave::execute
2. \Magento\InventoryCatalog\Plugin\InventoryApi\SetDataToLegacyCatalogInventoryAtSourceItemsSavePlugin::afterExecute
3. \Magento\InventoryCatalog\Model\SourceItemsSaveSynchronization\SetDataToLegacyCatalogInventory::execute
4. \Magento\InventoryCatalog\Model\SourceItemsSaveSynchronization\SetDataToLegacyCatalogInventory::updateSourceItems
5. \Magento\InventoryCatalog\Model\SourceItemsSaveSynchronization\SetDataToLegacyCatalogInventory::getStockStatuses (here the problem starts)
6. \Magento\InventorySales\Model\AreProductsSalable::execute
7. \Magento\InventoryIndexer\Model\IsProductSalable::execute
8. \Magento\InventoryIndexer\Model\ResourceModel\GetStockItemDataCache::execute
9. \Magento\InventoryIndexer\Model\ResourceModel\GetStockItemData::execute

In step 4 (\Magento\InventoryCatalog\Model\SourceItemsSaveSynchronization\SetDataToLegacyCatalogInventory::updateSourceItems) the stock status is fetched from the exact same table that this function tries to update(cataloginventory_stock_status) if the stock id is equal to the default stock id. Hence the old value is reused when executing the status update on line 205(\Magento\InventoryCatalog\Model\SourceItemsSaveSynchronization\SetDataToLegacyCatalogInventory)

[m2-assistant[bot]]

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