Drawer stops responding to touch input

I have a QML Drawer that pulls down a status overview. The Drawer contains a ListView with a long list of status information.

Sometimes, after scrolling in the ListView, the Drawer stops responding to touch input and can't be closed.

I have found that when the Drawer is in a non-responsive state that 
QQuickPopupPrivate::touchId is set to an old value which was never cleared.
 
This means that all touch events are ignored in QQuickPopupPrivate::handleTouchEvent due to a check inQQuickPopupPrivate::acceptTouch
 

bool QQuickPopupPrivate::handleTouchEvent(QQuickItem *item, QTouchEvent *event)
...
if (!acceptTouch(point))  <---- returns false
    return blockInput(item, point.position());

switch (point.state()) {
case QEventPoint::Pressed:
    return handlePress(...);
case QEventPoint::Updated:
    return handleMove(...);
case QEventPoint::Released:
    return handleRelease(...);
default:
    break;
}

bool QQuickPopupPrivate::acceptTouch(const QTouchEvent::TouchPoint &point)
{
    if (point.id() == touchId)  <---- touchId has wrong value
        return true;
    if (touchId == -1 && point.state() != QEventPoint::Released) {
        touchId = point.id();
        return true;
    }
    return false;
}

touchId is supposed to be set to -1 in QQuickPopupPrivate::handleRelease, but that is never called because pressPoint is not set.
 

bool QQuickDrawerPrivate::handleRelease(QQuickItem *item, const QPointF &point, ulong timestamp)
{
    if (pressPoint.isNull()) <--- pressPoint is not set
        return false;
    if (!popupItem->keepMouseGrab() && !popupItem->keepTouchGrab()) {
        velocityCalculator.reset();
        return QQuickPopupPrivate::handleRelease(item, point, timestamp); <-- Never gets called
    }
...

pressPoint is not set because the Drawer never receives the Pressed event.
I don't know why the Drawer sometimes don't receive the Pressed event, perhaps the ListView is stealing it. I havn't figured that out yet.
 
So what happens is that  # QEventPoint::Pressed event never comes

1. the QEventPoint::Updated does arrive
2. acceptTouch is called, finds that touchId==-1, and touchId is set. note at this time pressPoint was not set.
3. QEventPoint::Released event arrives, but is ignored because pressPoint==0. touchId is left with the old value.
4. The Drawer is now in the non-responsive state.
    
   There should probably be a change so that touchId is not set if pressPoint.IsNull() is true. or is only set in the Pressed event.