I joined a couple of new Stack Exchange sites recently, and noticed the message that appears when voting:
Thanks for the feedback! Votes cast by those with less than [15/125] reputation are recorded, but do not change the publicly displayed post score.
Hey, that's cool! I previously thought that you couldn't vote at all if you didn't have enough reputation. I assume this means that once you get voting privileges, posts that you voted on before the privilege change will now include those old votes in their displayed score. (Maybe I'm wrong about that, but if so then what's the point of recording them at all?)
Given that, this is my question: if my votes are actually recorded even before they count toward the public vote total, then why can't I see what I've voted on?
After I click the vote button, both the total and the button return (almost) immediately to their pre-vote appearance. Even without reloading the page, it's now impossible to tell which way I voted, or even if I've voted at all. Clicking on the same vote button multiple times shows no visible difference in behavior either, it's as though I'm voting anew with every click.
I only noticed this because I actually did accidentally downvote a question recently, and was distressed to realize that there's no way to undo that action---at least until I have enough reputation to vote publicly, at which point it will almost certainly be too late to change the vote anymore. All I could do was vote again in the opposite direction, which is really not the same thing. I can't even see the question under the "votes" tab on my profile. Surely there's no reason for this? It's easy enough to show my vote with the button appearance but still leave the total unchanged. IMO this behavior should be considered a bug.
PostFeedback
table in SEDE. They used to be displayed to 10k users but that was removed a few years ago. There is some old discussion on it. But mostly it's just... data, because, yay data. For the most part it hasn't found its true purpose yet. Probably crops up in fun data analysis SE blog posts and stuff.