Nope, I also have a 2018 and needed the update. They're obviously having problems with their database as mine also said it was up to date when I checked the VIN, but it was still running the older software and NAV was out of whack.
Check your system software to see what version you are running. If it's under 18.45.01, you need the update. In my case, I had 17.43.01 installed, but the website said I was up to date. I had to open a case with Uconnect support and have it escalated to get someone with more than 3 active brain cells to make the update available for my VIN. Once they did and I updated, all my NAV issues went away.
I'll double check my VIN again...