Please make sure that you have up-to-date app and maps data, and tell us where you see cross-border routing issues. There's an easy way to report it from the app using "Report a bug" button in the About dialog.
I’ll make sure to report it in the future!
[1]: https://www.openstreetmap.org/node/252814925 [2]: https://www.openstreetmap.org/node/276271393