StackView pop doesn't destroy the items

[Mark81]

Here my code so far:

import QtQuick 2.9
import QtQuick.Controls 1.0

Rectangle {
    id: root
    visible: true
    width: 1280
    height: 1024
    color: "transparent"

    Component.onCompleted: {
        stackView.push({ item: pageIN01, destroyOnPop: true })
    }

    StackView {
        id: stackView
        anchors.fill: parent

        delegate: StackViewDelegate {
                function transitionFinished(properties) {
                    properties.exitItem.opacity = 1
                }

                pushTransition: StackViewTransition {
                    PropertyAnimation {
                        target: enterItem
                        property: "opacity"
                        duration: 600
                        from: 0
                        to: 1
                    }

                    PropertyAnimation {
                        target: exitItem
                        property: "opacity"
                        duration: 600
                        from: 1
                        to: 0
                    }
                }
            }
    }

    Component {
        id: pageIN01
        IN01 {
            Timer {
                interval: 3000
                running: true
                repeat: false
                onTriggered: {
                    stackView.push(pageIN02)
                }
            }
        }
    }

    Component {
        id: pageIN02
        IN02 {
            onScenarioSelected: {
                stackView.push({ item: pageSC00, destroyOnPop: true })
            }
        }
    }

    Component {
        id: pageSC00
        SC00 {
            onBack: {
                stackView.pop({immediate: true})
            }
        }
    }

Having set the destroyOnPop property to true I'm expecting the item is actually destroyed on pop.
Instead I notice that they are still alice. For example I have some signals connected from C++ to QML:

pageSC00:

    Component.onCompleted: {
        MyApp.currentItemChanged.connect(currentItemChanged)
    }

    function currentItemChanged()
    {
        console.log("triggered!")
    }

The actual behavior is the following:

1. pageIN01 is pushed on the stack
2. after 3 seconds pageIN02 is pushed on the stack
3. until now, the currentItemChanged() is never catch
4. when the used do something that triggers the signal onScenarioSelected() pageSC00 is pushed on the stack
5. now, as expected, the currentItemChanged() is catch
6. when the signal onBack() is emitted, pageSC00 is popped (and I wish destroyed too) but unfortunately the currentItemChanged() is still catch from pageSC00!

Why it's not destroyed on pop?