Some properties get their default value assigned too late

Example:

Product {
    Group {
        id: blubb
        files: // ...
    }
    property bool blubbEnabled: blubb.condition
}

The "blubbEnabled" property gets the value "undefined", even though the group is enabled. If you add an explicit condition to the group, it works as expected.
This problem probably exists also for other items that have built-in properties with default values.