I just started using the Summit app for a day and realised now I involuntarily downvoted quite a few comments conviced I was upvoting them, fooled by the color of the swipe action (I didn't look at the arrow showing up until now) and wanted to remediate even if it's pretty inconsequential.
Another option if ths one isn't really possible, how to browse my read posts, at least I'd be able to find the discussions I had read through