Unknown region breaks map in Blogger's Audience stats

Blogging is all about vanity in the end, and to flatter ourselves we check on the audience stats provided by Blogger from time to time. Today I notice something rather peculiar: as I fiddle with the time-span (day, week, month) I notice that the maps works fine when it knows the countries in question.

But lately 'unknown region' has been showing up, and that seems to destroy the map altogether, so no country is coloured anymore. Tableau would have happily warned me of one null while still colouring all other countries.