[REG 6.4.1->6.5.0] Qt.binding in initial properties silently fails for certain types

import QtQuick
Item {
    id: root
    Component {
        id: rectangle
        Rectangle { }
    }
    Component.onCompleted: {
        let colorCalled = false
        let radiusCalled = false
        let obj = rectangle.createObject(root, {
            color: Qt.binding(() => { colorCalled = true; return '#ff0000' }),
            radius: Qt.binding(() => { radiusCalled = true; return 5 })
        })
        console.warn("color", obj.color, "evaluated", colorCalled)
        console.warn("radius", obj.radius, "evaluated", radiusCalled)
    }
}