Well, Pablo Hidalgo has given his answer to why we saw a “dish” on the Death Star framework in ROTS and the dish being installed 19 years later in the RO teaser.
Huh, it hadn’t even crossed my mind that that trailer shot directly contradicted the prequels. I just thought well that looks logical… and of course logic by it’s nature contradicts the prequels.
TFA was careful not to contradict the PT, opting instead to just ignore or not acknowledge cra*p like the midichlorians. It’ll be interesting what R1 chooses to do. I doubt it can set the film when it does and be able to fully except ROTS and ANH as both being canon. But would they go so far as to pretend the final shots of ROTS didn’t happen?