stationary points reported as 0,0

Given a sequence like the following:

QWindow window;

QTest::touchEvent(&window)
    .press(0, QPoint(10, 10));
QTest::touchEvent(&window)
    .stationary(0)
    .press(1, QPoint(40, 10));

The stationary point will be reported as 0,0 for the second sequence of touch events. This is causing issues for testing the QML touch support.