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I think I already explained this, but here it is again: From the looks of it, the frame lines of the live-action footage and the optical passes were not identical, and the bright edges from one of the elements (possibly the positive matte pass, the one with a black matte on white) were burned into the composites.
On most optical-composite frames you've shown us, it's just a white outline. However, in some of the shots with backlit elements, it's a glow, suggesting light seepage from the backlight pass. Perhaps the black area of the Kodalith didn't go all the way to the frame edge, and the light spilled around the edges. Again, in the optical compositing this would have been "burned in" to the image along with the lightsaber blade or lightning or whatever. This happens in the lightsaber training, and when the Jawas knock out R2 with their electrical weapon.
Normally, this stuff around the edges would not be seen since it's right at the frame line. However, you can see the glowing edge garbage in the saber training scenes in the Japanese Special Collection transfer (since it seems to have the most vertical picture info, at least in some parts), and you can see a weird blue blob in the bottom left corner of one of the shots of R2 and the lightning in multiple versions, including the GOUT.