Magento-2.4.3- Backorders – Inconsistent reference for an interface IsProductSalableInterface

Today, 25.10.2020. I faced a problem is: There is an inconsistency that a class reference for interface \Magento\InventorySalesApi\Api\IsProductSalableInterface is different between Adminhtml scope and Frontend scope. And “add-to-cart” functionality does not work properly If a stock status of a product is a backorder. Preconditions: Magento 2.4.3 Steps to reproduce: Set a product to be “backorders”…