This looks more like it was more of a deliberate design decision to save money. If the bad stoppers had pressure release that isn’t working properly, that’s a defect. The stopper having no pressure release whatsoever, is something else.

The products are missing a key mechanism in the stopper, meaning they can abruptly fling themselves at people when opened under certain circumstances. At least two dozen injuries linked to the recalled bottles and jars have been reported, including several who suffered permanent blindness as a result.