Can't run documentation example for programmable filters

I am just trying to run an example from Paraview 5.6.0 guide section 12.4 :

from vtkmodules.vtkCommonDataModel import vtkDataSet
from vtkmodules.util.vtkAlgorithm import VTKPythonAlgorithmBase
from vtkmodules.numpy_interface import dataset_adapter as dsa
# new module for ParaDiew-specific decorators.
from paraview.util.vtkAlgorithm import smproxy, smproperty, smdomain

@smproxy.filter(label =" Half -D Filter ")
@smproperty.input(name =" Input ")
class HalfDFilter(VTKPythonAlgorithmBase):
    # the rest of the code here is unchanged.
    def __init__(self):

    def RequestData(self, request, inInfo, outInfo):
        # get the first input.
        input0 = dsa.WrapDataObject(vtkDataSet.GetData(inInfo [0]))
        # compute a value.
        data = input0.PointData ["D"] / 2.0
        # add to output
        output = dsa.WrapDataObject(vtkDataSet.GetData(outInfo))
        output.PointData.append(data, "D_half");

with D instead of V to fit my data, which is a 256x256x256 Structered Grid, not a PolyData, maybe that’s the problem…

The problem is that the append function doesn’t actually append the data, just the name !
Some outputs :

    output (BEFORE append) :
    type : <class 'vtkmodules.numpy_interface.dataset_adapter.PolyData'> <class 'vtkmodules.numpy_interface.dataset_adapter.DataSetAttributes'>
    keys :  []
    values :  <vtkmodules.numpy_interface.dataset_adapter.VTKNoneArray object at 0x7efdc9f1b748>

    data :
    type :  <class 'vtkmodules.numpy_interface.dataset_adapter.VTKArray'>
    values : [-0.0003911  -0.00040877 -0.00042751 ... -0.00191144 -0.00189098

    output (AFTER append) :
    type : <class 'vtkmodules.numpy_interface.dataset_adapter.PolyData'> <class 'vtkmodules.numpy_interface.dataset_adapter.DataSetAttributes'>
    keys :  ['D_half']
    values :  [] 

I then got my hands a little bit dirtier and found the source of the append function which is in /usr/lib/python3.7/site-packages/vtkmodules/numpy_interface/ (line 686). Adding some print here and there in the function body, I found that I actually have a AttributeError while copying the data to the new vtk compliant object. This fails silently since the except section only contains a pass statement…

I am running Paraview 5.6.0-5 as can be found on Archlinux’s community repositories, and Python 3.7.3-1.

Thx for your help !