I tested it with my phone and got similar results: I got only 9 out of the 21 QR codes to work. I don't know why you think such a finding should not be mentioned here.
I think it should be mentioned but without the "so I'd recommend against using", because that's wrong. Also, specify OS, surface, time, etc for better test!
I think it should be mentioned but without the "so I'd recommend against using", because that's wrong. Also, specify OS, surface, time, etc for better test!