On a sidenote: I’m almost certain by now that it has something to do specifically with objects that are moving at a very slow speed, almost standing still.
That’s why my first assumption was TemporalAA, as it as far as I understand “shakes” the frame in order to find the lines to antialias - maybe this is not working correctly, when objects move so slow that TAA doesn’t “know” if they are still moving at all? Apologies for this very crude explanation of my thoughts 