command_button widget is not visible anymore

The "command_button" panel widget is not visible anymore. All the property actually disapear for the filter.

Steps to reproduce:

Open ParaView
Wavelet, Apply
AddFieldArrays
PropertyPanel is empty

Note:

This is the related XML:

  <Property command="Modified"
            label="Reload"
            name="Reload"
            panel_widget="command_button"
            panel_visibility="always">
    <Documentation> A convenient way to reload the data file </Documentation>
  </Property>

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