ImageSetDrawingStroke() not working with ImageDrawBeveledRect()

I'm trying to change the drawing line width of the line that is drawn using ImageDrawBeveledRect(). The docs say I can use ImageSetDrawingStroke() on the drawing function, but it seems no matter what I try I can't get it to work and it always sets the bevel line drawing width to 1 and ignores the settings in ImageDrawBeveledRect() (sample code below).

Am I doing something wrong, or is this a bug?