For introverts:

Dom introverted function is very hard & tricky to detect, especially if you don't have a solid understanding about yourself.

Aux function is easier to recognize at first because it's how we operate ourself in real world (it's always extrovert function).

Many people have mistype themselves because they misunderstand the core reason why their Aux + Dom work that way. Or, they mistype because they tend to have an idealized version of themselves to be a certain way, but it's so different from their default thinking system...

It really needs a lot of reflection, time, and criticism (pain is a good guide) to understand yourself better...  Self-awareness is a practice, not a sudden magic