If you can't easily find examples where your reasoning led you to a new correct conclusion instead of new sympathy toward a wrong conclusion, this is worrisome.

Aside from what I say in my other comment, I'll also remark that the "majoring in a quantitative subject increases expected earnings" case study provides an example of the type that you seem to be looking for. It's doesn't provide an example of a shift from a belief to its negation, but it provides an example from a state of high epistemic uncertainty to reasonably high confidence. This is significant.