ListView contentHeight keeps changing

Augustas

Hello,
I've noticed if I have multiple different height elements in a list view, it's contentHeight keeps changing when scrolling.
I've noticed there's a bug reported related to this, but it says that it's the intended functionality.
That is very weird, because if you have a ScrollBar in the ListView, the ScrollBar height keeps changing when scrolling.
I just wanted to make sure if this really is the intended funcionality, not a bug.

Tested on Qt 5.14.2, 5.15.2 & 6.2.1
Minimal code required to reproduce the issue:

import QtQuick 2.14
import QtQuick.Window 2.14
import QtQuick.Controls 2.5

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    ListView {
        width: parent.width
        height: parent.height

        model: [ 50, 100, 50, 100, 50, 100, 50, 100, 50, 100, 50, 100, 50, 100, 50, 100, 50, 100, 50, 100  ]

        ScrollBar.vertical: ScrollBar {
            id: scrollbar
            width: 16
        }

        onContentHeightChanged: console.log("content.height: " + contentHeight + " contentItem.height: " + contentItem.height)

        delegate: Rectangle {
            width: parent.width
            height: modelData

            border.width: 1
            border.color: "black"
        }
    }
}