For some reason my out-of-stock products reappear as 'in stock' whenever I update the product by a csv import.
Even if I import a single column; the 'sku' column, the affected products suddenly appear in stock.
I don't want imports to affect the stock level, as I'm constantly updating products via csv on a live store. I have intentionally left out all qty or stock related columns on my import sheets.
Does anyone know why this is happening? Is it an intended feature, a bug, or configurable? Stock management is enabled in config, and all products use config settings for stock management. I'm using Magento 2.1.7