Error with instancing in depth pre-pass and shadows

The instancing/Primitives.qml lancelot scene produces several warnings like this under Metal:

Failed to create render pipeline state: Vertex attribute qt_instanceTransform0(8) is missing from the vertex descriptor
Failed to build graphics pipeline state
Failed to create render pipeline state: Vertex attribute qt_instanceTransform0(7) is missing from the vertex descriptor
Failed to build graphics pipeline state

and similarly under D3D:

Failed to create input layout: Error 0x80070057: The parameter is incorrect.Failed to build graphics pipeline state

The same is visible with the BenchmarkDemo: enable both instancing and shadows on Windows with D3D => crash