Just to help, I analyzed the saber duel scene and the only green things I can find are these:

Some dust or something flying from the sabers when they hit each other at one point, is kinda green here:

Then there's this cyan-colored flash happening one time, but it looks the same in the GOUT. It's frame 127297 in the GOUT. Could anybody check all the other releases and see if it looks the same?

Then there was also this thing that could probably be fixed pretty easily. It's something that probably got copied from the GOUT when Harmy re-did the sabers:

EDIT:

Here's how that flash frame looks in 97 SE TB version and the 2011 BD: