QDeclarativeEffect::setTextureImage(const QImage& value) leaks memory a lot

I am texturing an Item3D in QML with the textureImage property with a QImage which is set from C++ via the rootContext of the QDeclarativeComponent. The QImage texture is a rendering of a QGraphicsScene which is being updated. We want to update the Item3D texturing after each QGraphicsScene update - meaning a new QImage is rendered for each QGraphicsScene::changed ( const QList<QRectF> & region ) signal. The resulting QImage is updated in QML from C++ after each update.

This scenario leaks memory exponentially. After a minute or so, the test application is using 1.5GB of memory.

If the QImage is not updated as a texture (but the painting happening in any case), the memory consuption for the QML below is at steady ~20kB.

The QML that is being textured is as follows.

 import Qt 4.7
 import Qt3D 1.0
 import Qt3D.Shapes 1.0

 Viewport {
     width: 490; height: 720
     property Image textureImage

     Cube {
         scale: 2.0;
         id: theCube
         transform: Rotation3D {
             angle: 30; axis: Qt.vector3d(1, 1, 1)
         }

         effect: Effect {
             id: textureEffect
             textureImage: textureBitmapImage
             decal: true
         }
     }
 }

The QImage texture is updated to QML like so:

void QmlApplicationViewer::onTextureUpdated(QImage updatedTexture) {
    QVariant variantImage = updatedTexture;
    m_d->m_rootContext->setContextProperty("textureBitmapImage", variantImage);
}

Qt 3D is compiled from Git repository https://qt.gitorious.org/qt-labs/qt3d

I can provide complete source code privately on request.