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In the ps_stock_available table, not only the quantity for the attribute is updated, but also for the product with the 0 attribute.
A product with an attribute of 0 is the sum of all quantities with an attribute greater than 0.

In the ps_stock_available table, not only the quantity for the attribute is updated, but also for the product with the 0 attribute.
A product with an attribute of 0 is the sum of all quantities with an attribute greater than 0.