I've seen this a number of times. People (management and team alike) have said to me things along the lines of: "We don't have documentation, we are agile." Which, of course is not what the agile manifesto says, but is how some people have taken it.

Other sayings are "The spec is in the tickets, there is no user manual." "We have unit tests." and so on.

All this makes trouble - Especially when you consider in order to change a thing, you should aim to understand it's salient parts in the first place - but perhaps that is not agile or the scrum way according to some.