"TypeError: Cannot read property of null" error in "QML Dynamic View Ordering Tutorial 1" example

"QML Dynamic View Ordering Tutorial 1"
https://doc.qt.io/qt-6/qtquick-tutorials-dynamicview-dynamicview1-example.html
<Qt_installation_folder>\Examples\<Qt_vers>\quick\tutorials\dynamicview\dynamicview1

Outputs the following error when the View is scrolled:
qrc:/dynamicview/dynamicview.qml:66: TypeError: Cannot read property 'left' of null
qrc:/dynamicview/dynamicview.qml:66: TypeError: Cannot read property 'right' of null

Way to reproduce:
1) Build and run the "QML Dynamic View Ordering Tutorial 1" example
2) scroll the view. Find the errors in the "Application Output"

Using:
Component.onCompleted:

Instead of:
anchors

//on line 66

, seems to fix this. As far as I understand, it seems to try to read the properties before the component is completed.

It doesn't output the warning in Qt 5.12.12