Strange binding error in Flow element

[sedi]

Hi,

I receive a strange binding error that I don't understand. The output seems to work as expected. By commenting out unnessecary stuff I've tracked it down to this minimal example:

Flow {
        height: visible ? childrenRect.height : 0
        Repeater {
            model: [my model]
            delegate: CheckBox {
            }
        }
    }

Flow {
        height: visible ? childrenRect.height : 0
        Repeater {
            model: [my model]
            delegate: CheckBox {
            }
        }
    }

To copy to clipboard, switch view to plain text mode 

That gives me

QML Flow: Binding loop detected for property "height"

Please note: if I change height property to

height: childrenRect.height

height: childrenRect.height

To copy to clipboard, switch view to plain text mode 

(thus removing the ternary operator), the error does not occur. That especially leaves me puzzled.

Any ideas?