Steam Weathering Issue On Livery Designer

Hi,
I've been testing out weathering on my locos in Livery Designer, using Shape 96 in the Shape Layers, which is the colour gradient square. The results look fine in Livery Designer, but when I go in game, the weathering appears in discrete stripes in the loco as can be seen on the front and bodysides of 20069 below - not a good look!
I'm on TSW3 on Steam and have all settings cranked to high or ultra!

dave55007 (PinzaDave)

 

Yep it’s been like this a while, reported and remains unacknowledged. for me on ps5.
It’s what made me decide it wasn’t worth my time making liveries.
Strange thing is it looks fine in the design stages- so why is the lighting in the designer different from in game?