Testing giving QWidgets a second finger alone crashes Qt

QtWebEngine had tests doing the following

QTest::touchEvent(target, s_touchDevice).press(1, tapCoords, target);
QTest::touchEvent(target, s_touchDevice).stationary(1); QTest::touchEvent(target, s_touchDevice).release(1, tapCoords, target);

Which causes a crash under QMutableEventPoint::setTimestamp(const ulong t) 

Before the line 

QEventPointPrivate *pd = QPointingDevicePrivate::get(
const_cast<QPointingDevice *>(d->device))->pointById(id())->eventPoint.d;  

d is valid, but after that line it is suddenly 0, and causes a crash when state() is tested.

Replacing the finger id 1 with 0 in the QtWebEngine tests fixed the issue, but means the test ABI changed dangerously.