As you might now I have an dual interest in product barcodes. First, there is my book treating all kinds of barcode symbologies supported by iOS. Second, there is ProductLayer where we are building a crowd-sourced product database via the prod.ly social network.
At first I thought that the problem would only exist for really low quality bar codes (rdar://19438067) but now I found a perfectly good looking specimen that has the same issue: iOS does not recognize it.
Filed as rdar://22048146 and on Open Radar. I am hoping that Apple can fix this issue before iOS 9 is done.