QtQuick dragging: Mouse cursor is off while dragging item

When dragging an item using the Drag API in QtQuick, the mouse cursor position is off.

This is hard to describe in words, but let me try:

In QtWidget land, the drag behavior basically follows this principle (easy to verify by dragging some widgets in a QtDesigner form):

1) Mouse press and hold
2) Move cursor
3) Eventually Qt interprets mouse move as drag
4) Underlying item is immediately moved to the mouse position when a drag is registered
5) Underlying item is further moved in sync with the mouse cursor

In QtQuick, this is slightly different:
Basically, step (4) is missing here.
Because of this, the cursor is off when further dragging the item.

Attached the slightly modified example from http://qt-project.org/doc/qt-5/qml-qtquick-drag.html#details.

How to reproduce:
Drag the red rectangle about (50,50) pixels

What I'd expected as example output:
press: 5, 6
release: 5, 6

But what you get is something along:
press: 5, 6
release: 10, 17