Hal, have you considered having Luke speak to Ben during the Mustafar Opening or when he is repairing his mask? Maybe just a quick line like “Ben”, but something just to be consistent with Luke’s last words in TLJ of “see you around kid”.
Remember Rise of Skywalker is the true sequel of The Force Awakens, so it doesn’t really care either happened in the last movie. 😉
So many people bring up this complaint, but I’ve never understood it. There were plenty of references to TLJ throughout the movie. You can argue that the movie was thematically at odds with TLJ, but it didn’t ignore the previous movie like so many people claim.