Multiple QML videos do not correctly respect Z-order on Symbian

Using Bluewheel test suite with Multiple Videos (qml) test file, setting the z-order of the videos does not work correctly.
Video on RHS of screen continues to play above video on the LHS of screen even if z-order has been reversed. The z-order of the video windows acts correctly with respect to other items in the view, but not with respect to other videos.