I had to switch around a few areas in Yamato because I added a new World map graphic. After I did some of the Towns (Akumatani & Inukaze) became thin lines I can not interact with. I can only highlight them when I select them in the search bar menu and I can not click on the 3 dot menu on the top right of the Area menu either.

I used Opera and Mozilla Firefox. Pollution had the same issue after cloning my world. Screenshot you can find in Discord under Questions.