(commonly known as the Scrummerfall anti-pattern)
Consider the following familiar situation
The team has taken a story in the sprint, and during the sprint, shit hits the fan.
They rework, rework again several times to get it to done. Then the “we-could-have-avoided-this” feeling enters the minds of the team...
In the Retro the conclusion is clear:
We could have avoided this!! We had to analyse this better! We need analysis upfront!