From a Watsonian perspective, maybe they have developed better methods to check if anything on the ship is transmitting a signal. So when they jumped to lightspeed, they scanned the ship and found nothing was transmitting a signal out. I also could imagine the Resistance/Republic developing some kind of device that can jam outgoing signals that would render physical tracking devices useless.
I think this is one of those things that we possibly overthink, but I think it is important to rationalize everything in a story if one plans on taking part in telling that story (in this case as fan editors). But I feel like this kind of thing could be explained somewhat in a novelization or something.
Sometimes when I think about this plot, it does kind of make me wish that the plot revolved around a possible spy aboard the Raddus. Rose thinks its Finn, Poe thinks its Holdo, etc etc.
It could’ve gone into how First Order spies have infiltrated the New Republic and how the Resistance was formed to avoid that, but now they’re compromised in their most desperate moment. And we could see the gang try to find the real spy while the Resistance falls apart without Leia, their symbol of hope, to keep them together.
I also could picture some pretty cool ships sets they could’ve built too have adventures all throughout this giant cruiser as they look for the spy. But maybe the whole side plot just being on the Raddus would’ve been boring. You would also have to figure out a different way for Finn to learn to fight for a cause he believes in.
While it is fun to imagine, and I think I would eventually love to see a novel with that kind of plot, I’m kind of thinking/hoping that IX will add importance to the Canto Bight sequence if they resolve the issues it presented, like how greed feeds the cycle of war, helping over hurting, etc. If that, or at least how they’ll end the war, doesn’t get addressed, or the lessons Finn learned from there don’t carry over, it won’t hold as much value as it could have.
The one thing I do wish, is that Canto Bight was physically closer to Crait, because if you look at one of the updated galaxy maps, it is like halfway across the galaxy. I know travel time in hyperspace has never been very consistent, and some hyperdrives are faster than others, but it does push it a little. At least it seems like they were on Canto Bight for only like two or three hours, tops, and the ship DJ stole to get back looked really fast.