If said code paths work correctly on the supported operating systems and browsers why does it matter? You could say that it's a poor technical decision but that

If said code paths work correctly on the supported operating systems and browsers why does it matter? You could say that it's a poor technical decision but that's really not up to the support to address. I guess you could reproduce the bug on a supported OS and browser by manually changing the user agent but I doubt the support would accept that either. It would be like complaining that the site becomes unusable if you disable javascript or images, they probably only support "vanilla" browsers.