Most of Necro's issues were with easily explained canon, so easily addressed. Of course, I don't expect anyone to know those things, because not everyone is as familiar with the specifics as I am, given I've read many of the books and comics, as well as the animated series and played a lot of the games. A lot of those things can be taken for granted when you're more familiar with the subject, however the film doesn't cover them, and it can't be expected to or it'd be even longer.
I agree that Leia's space walk was pretty out of place, though. It seemed a bit too cringy; it would have been easier to have her just use her latent powers to stop herself getting sucked out of the breach or something, but I guess the director wanted something flashier. Naturally, her survival predates the sad death of Carrie Fisher, and my guess is that there were plans to show more of her abilities in the future. Issue is, now, how will they resolve the character and the actor?