Thanks, Ben !
Just a quick heads up about my experience of the bug : I currently can use BSP correctly if I don’t change the scale of the material being applied on it, so I think I’m in the exact same situation as Daverm. A previous testing level was really messing BSP colors and scale, but since I changed my level, it only discards the scale changes as soon as I do something else in the level.
Thank you for considering this bug !