I recently encountered an answer that I'd up-voted years ago. But since then, I'd learnt something that allowed me to now see a fundamental problem with it. (The post had been edited in the meantime.) So I changed my vote (by un-up-voting and then down-voting).
When I inspect the timeline vote summaries, the new vote is listed, but the un-vote is not, and neither is the original vote.
What is the rationale for not showing un-votes in the timeline vote summaries?
Possibly related: New timeline view only shows *last* accept vote, no un-accepts