Love that book.
I just had to try this of course !
I would consider this a FEATURE, not a BUG.
Never said otherwise?
You don’t need to download anything. If your base camera app does not interpret as a QR code, then take the photo and then open it in an app like Google Photos. At the bottom of that is a Lens icon - use it. It is pretty good at reading QR and text. It’s not so great at identifying specific items, use a specific app for identifying those.