I’ve written a few times (here and here) about how every time you change something, every bug anywhere near that area now becomes your fault.
In my current job, I was in charge of a system called “Entitlements” that controlled who could do what and could access what parts of the system. Which means that dozens of new defects come to me with a note from the business analyst or equivalent person saying “looks like an Entitlement issue”. And I have to look at it and say “no, the reason they can’t access that part of the site isn’t because of Entitlements, it’s because NOBODY WROTE THAT PART OF THE SITE YET”.
Side note: we’re using “Agile Development”, which is a short form way of saying “we don’t know what the fuck we’re doing from day to day, and we’re not sure what has been done and what hasn’t until somebody complains that it’s not done”.
The good part is that because we’re Agile, that means when I discover that the problem is that nobody wrote that part of the site yet, I get to write it. So yay me.