Don't feel bad.
Many $$$ lawsuits against doctors, hospitals show that even world-class surgeons leave retractors and sponges inside patients.
The IQ-related problem solving ability (A: designing an engine) isn't closely related to memorizing check lists (B: "did you turn off the stove"?).
Your credentials in "A" are far more important than one failure in "B".


Boffin Emeritus