I'm using Fedora release 30 (Thirty) 5.1.11-300.fc30.x86_64

Here is a screenshot in the Gnome-3 environment:
http://makar.homelinux.net/ftp/pub/exchange/20190621/Screenshot_20190620_144441.png
When selecting the city Simferopol highlights the Russian Federation (and in fact, correctly - Ukraine)

Here is a screenshot in KDE:
http://makar.homelinux.net/ftp/pub/exchange/20190621/Screenshot_20190620_214525.png
When choosing a city, Simferopol highlights Europe / Russia (and in fact, rightly, Europe / Ukraine)