Drag and Drop not works as expected - drag-and-drop

Question

I have 2 identical Items in the scene. Each one can be dragged and also accepts interaction with other dragged objects. To avoid interactions with itself I set drop.accept = false in appropriate drag functions. It works fine when I drag for example rect1 over rect2. rect2 responds to entering and exiting events. But if after that I try to move rect2 over rect1 the drag mechanism stops working and dragging events are not called at all, even if I again move rect1 over rect2.
My target is to know, at each moment of dragging, what object is dragged and on which objects it is moved over.
import QtQuick 2.4
import QtQuick.Window 2.0
Window {
id: win
width: 800
height: 600
Rectangle {
id: rect1
objectName: "rect1"
width: 100
height: 100
x: 200
y: 200
color: "orange"
property bool hold: false
z: hold ? 2 : 1
Text {
anchors.centerIn: parent
text: "rect1"
}
MouseArea {
id: area1
anchors.fill: parent
drag.target: rect1.hold ? rect1 : undefined
onPressed: rect1.hold = true;
onReleased: rect1.hold = false;
}
DropArea {
anchors.fill: parent
onEntered: {
if(drag.source == rect1) {
drag.accepted = false;
}
else{
drag.accepted = true;
console.log("rect1: entered");
}
}
onExited: {
if(drag.source == rect1) {
drag.accepted = false;
}
else {
drag.accepted = true;
console.log("rect1: exited");
}
}
}
Drag.active: rect1.hold
Drag.source: rect1.hold ? rect1 : undefined
Drag.hotSpot: Qt.point(width/2,height/2)
}
Rectangle {
id: rect2
objectName: "rect2"
width: 100
height: 100
x: 500
y: 300
color: "lightblue"
property bool hold: false
z: hold ? 2 : 1
Text {
anchors.centerIn: parent
text: "rect2"
}
MouseArea {
id: area2
anchors.fill: parent
drag.target: rect2.hold ? rect2 : undefined
onPressed: rect2.hold = true;
onReleased: rect2.hold = false;
}
DropArea {
anchors.fill: parent
onEntered: {
if(drag.source == rect2) {
drag.accepted = false;
}
else {
drag.accepted = true;
console.log("rect2: entered");
}
}
onExited: {
if(drag.source == rect2) {
drag.accepted = false;
}
else {
drag.accepted = true;
console.log("rect2: exited");
}
}
}
Drag.active: rect2.hold
Drag.source: rect2.hold ? rect2 : undefined
Drag.hotSpot: Qt.point(width/2,height/2)
}
}