Now that I think of it it would be nice if we could figure out some solution(s) to Mustafar. I do have a couple ideas in mind.
I’ve seen some other people post tests were they added more establishing shots culled from other sources. I think that’s probably your best bet. There is a canon reason why Mustafar looks the way it does in this movie but for someone only tuned into the films it’s a bit confusing.
Im definitely more on the “movie canon” side of things. The people in the audience should not have to look into movie, comics, tweets, video games for major plot things, or at least significant bits of information for a movie.
So yeah, it is either adding some establishing shots or removing the whole section and just have the info about it in the crawl that Kylo has obtained a/grandfathers/snokes/insert-something’s Sith Wayfinder. At least that’s my personal view.