It’s not necessarily true that lossy audio tracks could not be conformed to a new standard that includes more frames, especially when those frames occur at reel transitions. One could simply split the ac3 track at the appropriate position and insert a silent ac3 frame before rejoining. Now, this would not be a perfect solution, as Dolby digital uses an audio frame rate of 31.25 fps, while the film runs at 23.976 FPS.

The result for a single missing frame is that the audio is off by roughly 0.232 frames, rather than a whole frame. This would arguably be a “good enough” compromise for many of the tracks. This would work especially well in the case of Star Wars as that bit of silent audio would not be noticeable for the affected reel transition. However, it is admittedly more problematic for the two missing frames in ROTJ, as those do not occur at a reel transition.