Turns out this is because the campus racetrack was the first with an SVG path that didn't have a transform attribute, which in turn caused the buggy rectangles to not have their "centering" translation (nudging them left and up half their width and height respectively).
Turns out this is because the campus racetrack was the first with an SVG
paththat didn't have atransformattribute, which in turn caused the buggy rectangles to not have their "centering" translation (nudging them left and up half their width and height respectively).FIx was straightforward but diagnosis wasn't!