If the iOS 27 extent follows the scroll view's edge elements, then a refresh control that has collapsed to zero height after endRefreshing() should contribute zero height. Right now it still reserves its expanded height until it's detached or until the next navigation. That doesn't match the new design either. Is the refresh control's height meant to be re-measured when it collapses? Separately, a UIRefreshControl that has been detached and re-assigned never fires again. That's unrelated to FB20756572

Happening to me as well on Xcode 26 Beta 3 and simulator with iOS 18.3.1. It also occurs on real devices with iOS 18.