Box clip with vtkTableBasedClipDataSet and sharp edges?

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And just in case someone wants to reproduce this:

xmin, xmax, ymin, ymax, zmin, zmax = 5.818, 9.0315 5.818, 9.0315, 5.818, 9.0315

And the ImageData used in this example: uniform.vtk (13.8 KB)