In looking over my ROTJ Custom SE which was sourced from the 19SE and Labyrinth of Evil which was sourced from the HDTV transfer, it does seem pretty consistently blue.
When I imagine the scene in ROTJ, it does seem purplish, so perhaps that was indeed a 1997/2004 peculiarity. As things stand, though, it really doesn’t seem merited to change the color even if I did feel like being a stickler for it.