That isn't a good thought experiment. Unconscious biases are likely to have much more effect in ambiguous situations where it's harder to try to understand som

That isn't a good thought experiment. Unconscious biases are likely to have much more effect in ambiguous situations where it's harder to try to understand someone's motivations or how to react, than in a situation where those things are clear. Their absence in the latter does not imply their absence in the former.