Wrong cursor behavior for QTreeWidget's HeaderView, when QTreeWidget is used in a QGraphicsScene

It is wrong cursor behavior for HeaderView part of QTreeWidget, when this widget is added to QGraphicsScene. Please take a look at attached image files:

1) When we want to resize sections of tree's header, it needs several attempts to change cursor shape from ArrowCursor to SplitHCursor (image 01)

2) When cursor is changed to SplitHCursor, it still has this shape when the cursor inside a header but in the middle of a section (It should be ArrowCursor, not SplitHCursor) (image 02)

Other widgets, like: QTreeView, QTableWidget, QTableView have this behavior as well.

In the attachments you can find a project to demonstrate this.