the packagers had not changed it as they were asked to do
Were they really? Or were they told “change it if you don’t like it”? Genuine question, and it would make some difference.
But in either case I’m sure not all of them did, and failing that it is all down to the one person (or worse, one team of people) administering the system. Badly configured networks resulting in DNS problems is not exactly rare, but that is beside the point. It’s clearly wrong no matter how uncommon is the situation that makes it materially detrimental.