Sometimes we have learned the wrong thing for a long time and implemented it accordingly. We might be rushing for another event or just a little hasty to get the job done so we don’t stop and correct the mistake immediately. Doing so will likely extend the issues for a much longer period.
In manufacturing items, the later you discover the mistake, the worse the impact is. This is because the amount of time required to make something needs to be taken into account to be restarted. Also, things are either often made in bulk or many suppliers need to be coordinated.
This is the same in the digital world, especially if something already goes live. Once real people are involved it is so much harder to fix and also involves having reputations tarnished.
Everyone makes mistakes and it is somewhat inevitable. Just don’t make the mistake much bigger by delaying the fix.