I can anticipate how it got past Q&A; I expect they just never got asked a question related to this scenario so therefore didn't have an answer for it.
More to the intention of the thread though; as someone in the QA space its always surprising to so commonly see assumptions that a random defect existing in retail ultimately being a QA fault. Typically that they didn't encounter the defect. Given its an open world game that's entirely possible, but it's far more common to see defects, especially of this nature, raised by QA and dismissed at a slew of various production phases.
Take too much time and/or money to resolve? 'Will not fix'
An expected technical limitation of the engine and/or level design? 'Working as intended'
Assumed to occur for such a small volume of players? 'Known Shippable'
And this can go on and on and on... A project of this scale will see thousands of defects raised with extensive test passes; and you can expect there will be hundreds that release knowingly and very much intended. That said the polish of Witcher 3 in particular is fantastic for the scale, ambition and development timeline of the game.