uh ... I know this syndrome very well!
In the past, I did research on this subject.
it is also called the superiorite illusion.
I "self-confidence poisoning"
I like your head more.
and among the people it is called "ignorant courage".
Two expert psychologists call this unconscious, the chronic self-assessment inability. Absolutely there are people around you. You will think inside; "How did this man or woman come to this level?"
the employee is incapable of assessing its own capacity and diagnosing its shortcomings. but what is really bad is "inadequacy + not knowing how" cocktail
it creates an irresistible driving force from a professional point of view. an excuse in terms of career, turning into a plus. Believing that his work very well be "insufficient"
he will not feel the slightest inconvenience of being prominent in all things and aspiring to missions.
on the contrary it will see it as a "right". he will know "wakefulness".

In the meantime, people who are genuinely knowledgeable and talented will act "too humble" in their working life. they will be unfair to them. they will not come forward. they will probably be blamed by their superiors for "lack of ambition".