In fairness, HN wouldn't show more than what, twenty-ish thread roots at a time, requiring you to click "more" to bring in more... which could contain the same set of thread roots you'd been looking at, depending on upvote activity.
(I assume that this update has removed that HN restriction, but haven't bothered to go look to verify this assumption.)
The update appears to have come with unlimited or much higher page size. I don't think anyone has found a thread that is still split into multiple pages.