QML AnchorChanges do not compile in strict mode

AnchorChanges {
    target: myRect

    // could not compile binding for top: Cannot generate efficient code for internal
    // conversion with incompatible or ambiguous types: QQuickItem::top with type
    // QQuickAnchorLine (stored as QVariant) -> QQuickItem::top with type QQuickAnchorLine
    // (stored as QVariant)

    anchors.top: window.top
    anchors.bottom: window.bottom
}