A junior developer at a retail company was assigned the task of deprecating an unused field from an internal REST API.
While cleaning up the code, the developer mistakenly made a subtle change in function spelling which went unnoticed in the code review.
Another team had an end-to-end test for a specific product that failed intermittently, and the test was disabled to avoid blocking a production release.
After investigating the issue, the bug was traced back to the refactoring mistake, which could have prevented customers from placing orders for best-selling products.