The starting area of Cartanica seems to be changed, buildings were added, a crossroads for the train and Cidney's truck (this might be a glitch too. I've seen people not able to do this and it seems like it only works if you skip the trainride in chapter 10. ). This all used to derender when you went back there before but it seems like it doesn't anymore? It's hard to say, but the JP site had an updated chapter 10 listed in their patch notes on their website for a brief period, this is maybe coming next month? They probably accidentally uploaded next month's updates instead of this month's (of course, this could all just be a mistake though and nothing new will be added): https://www.resetera.com/threads/fina...
Reddit thread: https://www.reddit.com/r/FFXV/comment...
Compare with previous version of Cartanica:
• Final Fantasy XV - Out of Bounds (OOB) Exp...
We'll probably find out next month if an explorable Cartanica will really be a thing..or if they just added some buildings as backdrop. I know we could see some stuff from the train before, but going back there never loaded in any buildings and now it does. I know we were able to see assets of episode Prompto before it came out in the main game as well, so there's a possibility. Let's hope : D But we'll see.