Most common reason a shot is flipped is to avoid breaking the 180 degree rule.
This is never the fault of the editor, as they have to work with the footage they have in order to make a scene work shot-to-shot. Breaking the 180 degree rule is far worse for flow of a scene than a reversed image, hence why they tend to pop up a lot in many movies. We only notice them more in Star Wars because we observe them repeatedly, much more than any other film.
Yeah, definitely not the fault of the editor, they’re the one trying to fix it. Looking at the Leia/Jabba pics on a bigger screen, that’s definitely to fix 180. As the the skiff and barge heading to the sarlacc, that’s a combination of keeping the flow of movement from left to right, and also keeping the same position of the two vehicles the same, relative to each other, throughout the sequence.