Problem Clipping Unstructured Grid with Quadratic Quad Element

I am having trouble to correctly clip an unstructured grid with vtkClipDataSet. For cells of type VTK_QUADRATIC_TRIANGLE the cell data seems to be clipped correctly but for VTK_QUADRATIC_QUAD cells the clipping messes up the cell data as seen in the image.
Any advice how to fix this?

I am currently using VTK 8.1.1 with Python.