It seems that some but not all attached properties in a ColumnLayout can be accessed by child elements, which can lead to layouts simply breaking silently.

Consider the following code:

ColumnLayout { 
    id: column
    anchors.fill: parent  
    Repeater { 
        model: 3 
        delegate: Rectangle { 
            Layout.fillWidth: true 
            Layout.fillHeight: true 
            color: Qt.rgba(Math.random(), Math.random(), Math.random())  
            Component.onCompleted: console.log("completed", column, row, maximumHeight, maximumWidth, minimumHeight, minimumWidth) 
        } 
    } 
}

An access to the ColumnLayout by its id isn't possible from inside Rectangle, since 'column' seems to refer to the attached property 'column' from ColumnLayout, which should normally be accessed though 'Layout.column'.

Example code is attached.