Scene2D not rendering

Scene2D is not rendering, or rendering a fully black plane. This can be reproduced with the 

render-qml-to-texture-qml manual test in Qt 3D.

With QT3D_RENDERER=opengl, the following errors are produced:

QQuickRenderControl can only sync when beginFrame() has been called
QQuickRenderControl can only render when beginFrame() has been called