Despite not updating any extent: Programmable filter "ERROR: [...] The update extent specified in the information for output port [...] on algorithm [...] is [...], which is outside the whole extent [...]."

The origin of this bug is probably this one: vtkPVPostFilterExecutive (0x1e3ecaa0): The update extent specified in the information for output port 0 on algorithm vtkPVPostFilter (0x1f196a90)