Breaking it down, in the first shot Leia looks up and slightly to the left, as if she’s looking at something above and to the left of the camera.
In the flipped Boba shots, he slowly raises the gun but it is also pointing to the left, implying that he is aiming at something to the left of camera.
Putting them together, it feels like the camera is jumping from one side of the 180 degree line to the other. I will agree that it’s a bit unclear where the eyelines are supposed to be going and the camera is almost on that 180 degree line already.