Custom skin color signpost bug?

During some recent testing I discovered that while the wiki and all other sources containing info on custom skin colors say that the invshade field will change the signpost color, it in fact only changes the color of the background on the save select screen. In the example below, I have the vanilla blue skin color with a red invcolor along with an invshade of 0, which should give the signpost a light pink color. However, the signpost is clearly a different color and will stay that same shade no matter what invshade is set to.