As someone already noted; there is a a cognitive bias called The Halo effect, which might explain the initial belief that a person you considered knowledgeable in one area must be an expert in all areas. Possibly what you are describing is a sense of disillusionment upon realizing that this is not the case?
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As someone already noted; there is a a cognitive bias called The Halo effect, which might explain the initial belief that a person you considered knowledgeable in one area must be an expert in all areas. Possibly what you are describing is a sense of disillusionment upon realizing that this is not the case?