ScrollBar, ScrollView drag crash (iOS)

I have a ScrollView with vertical and horizontal ScrollBars whose active states are bound to each other as in this documentation example: "Binding the Active State of Horizontal and Vertical Scroll Bars" https://doc.qt.io/qt-5/qml-qtquick-controls2-scrollbar.html#binding-the-active-state-of-horizontal-and-vertical-scroll-bars

Here is the relevant code:

import QtQuick.Controls 2.2 as QtControls

QtControls.ScrollView {
  QtControls.ScrollBar.horizontal: ScrollBar { id: hbar; active: vbar.active }
  QtControls.ScrollBar.vertical: ScrollBar { id: vbar; active: hbar.active }
}

In my case, the contents of the ScrollView are not large enough to require ScrollBars, yet when I attempt to drag anyway (slide my finger on the ScrollView), the ScrollBars activate each other recursively (see attached stack) and eventually my app crashes.