ListView children having QQuickItem type instead of expected type

import QtQuick
import QtQuick.Controls

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

    ListView {
        id: testList
        model: 20
        cacheBuffer: 1000
        spacing: 2

        /*The following results in the 2nd delegate showing up as a QQuickItem in the list of children of the ListView*/
        anchors.fill: parent

        /*The following results in the delegate with the issue not being the 2nd but the first delegate that is not at least partially visible within the defined height of the ListView
//        height: 400
//        width: 400


        /*The following results in no issues at all with the list of children*/
//        height: 1000
//        width: 400
//        Component.onCompleted: anchors.fill = parent

        delegate: Button {
            width: ListView.view.width
            height: 30
            text: index
            Component.onCompleted: {
                console.log("Index " + index + " is listed as a " + testList.contentItem.children[index].toString())

            }
            onClicked: console.log("This is button number " + index + " functioning properly")
        }
    }
}