It's in the movie. I remember. I've never read the novelization.
It sounds like you're remembering this like many viewers claim to remember Paltrows head-in-a-box at the end of Se7en.
So we, (the wife and I) watched Rogue One on Friday evening at the local (and only IMAX in the country it turns out) and yes it had some flaws in the narrative structure and some issues of continuity issues with A New Hope if you look at them from certain points of view, but all in all, I bloody well loved it and most of the positive and somewhat negative things about the film have been said. - And the gender inequality seems very glaring.
As for the music, given Giacchino had a limited time to write and score the music, he did an adequate job, like Williams (and others) have done in the past, he did what sounds like reusing some themes from other films he has scored (the main Imp theme sounds very similar to the non-Jurassic Park segments of Jurassic Worlds score) and there a few moments where he has used Williams previous score to great effect, including the shuttle launch from Jedi.
ILM did a fantastic job with all the effects in the film, the way the two Star Destroys impacted each other, it really did look like they were physical models and not computer generated ones. As for Tarkin, I read months ago that the artists at ILM were having great trouble recreating Cushing for the film as there are very few (if any shots) of his entire body in Hope due to him wearing bright pink fluffy slippers on set and the were using footage from other films of his (including his Doctor Who ones) to digitally recreate him and I'm not sure if it's because I knew this in advance or not, but I didn't have any issues with the recreated Tarkin. As for Leia at the end, that was jarring, but could be down to a few things.
As for seeing Vader in the Bacta tank, I'm glad we only got a hint of what was inside and I was expecting K2 to be impaled through the chest, but of all the deaths, his was the most "upsetting" as it were.
All in all, it was a bloody good film and it might not be my favourite of the Star Wars films, it's easily either joint top or in second place, I just need to rewatch it to take more of it in.