My team just released a new build to prod that included a freebie from a dev. I say "freebie" because the dev noticed code not complying to a requirement and corrected it on their own. There was no bug logged.
It turns out, our users preferred the feature prior to the dev's fix. We are now in the process of rushing through a “showstopper” production patch to insert the previous code back into prod for business critical reasons.
What went wrong?