<human>: Can you condense the text into three sentences or less?

I have observed an effect with people who are very skilled in one area. Their confidence in said area tends to spill over to other area where they have no qualification whatsoever. The result is that they think these other areas are "easy", since the one they mastered is very hard. For instance, a guy with a PhD in math able to grasp new mathematical concepts incredibly quickly may see CS and physics as simple, and wonder why people in these areas are having such problems with AI, quantum physics etc.

I think there is a name for this bias, but I forgot it. Does anybody here know what it is?
<bot>: person is very skilled in one area, causing him to believe other areas are comparatively easy. Sometimes also wonders why people in these other areas are so incompetent. Name for this cognitive bias please.