Reviewers or people that are in a position of (some) power, like management or QA, feel only valuable when they can find something to critique. This could be a legitimate fault, a nitpick or illegitimate error.
One could appease these people with a duck Feature, to make them feel valuable even though it is malicious.
This could stem from multiple causes. It could be because of a bad working environment, upbringing or just as simple as an imposter syndrome.
Reference
Highlights or timestamps
Looks great! lose the duck. Highlights
Sometimes testers or management don’t feel that they’re doing their job properly unless they find something wrong.
— Looks great! lose the duck. Highlights from Looks great! Lose the duck.
There will occasionally be people with bad intentions or people who just want to seem important
— Looks great! lose the duck. Highlights from Looks great! Lose the duck.