Skybox BackgroundNorth not alterable?

I do not seem to get the renderView1.BackgroundNorth option to work. North seems to be pointed at by the y-axis (default). Does anyone spot an error? Or is it a bug? (I use ParaView 5.8.0 on Ubuntu 20.04)

The following MWE with image from reproduces the bug.

from paraview.simple import *
renderView1 = GetActiveViewOrCreate(‘RenderView’)
renderView1.UseSkyboxBackground = 1
renderView1.BackgroundTexture = CreateTexture(“ESO_-_Milky_Way.jpg”)
renderView1.BackgroundNorth = [0.0, 0.0, 1.0]
renderView1.BackgroundEast = [0.0, 1.0, 0.0]