So, what was the filename of your modified file with just quantity modified? What version is being used currently? What fields are in the file? What if any custom fields are used?
I took a "risk" and after downloading the file that was created from the section that says import/export for model/price/qty. I modified the file to change just the number of quantity for a product. I intended to delete all but the one row, but I uploaded all of the rows and had no loss of the product name. I did see the change of quantity that I uploaded, but didn't experience the issue described by following the above process...
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