They have totally screwed up or they are playing some game.
No way there's a good reason for this. It absolutely makes no sense.
In additon to the information supplied by fredderf I'm posting the countries which are included in the European zone maps:
On TT's website I found this regarding the zone maps:
[Please Register or Login to download file] Credit: Alfred_MLHigh-Level Europe_Central_965_7250 (17 countries, 1,06 GB)
Austria, Belgium, Czech Republic, Denmark, Germany, Hungary, Italy, Liechtenstein, Luxemburg, Malta, the Netherlands, Poland, San Marino, Switserland, Slovakia, Slovenia, Vatican City
Low-Level Europe_Central_965_7280 (19 countries, 1,05 GB)
Austria, Belgium, Czech Republic, Denmark, France, Germany, Hungary, Italy, Liechtenstein, Luxemburg, Malta, Monaco, the Netherlands, Poland, San Marino, Switserland, Slovakia, Slovenia, Vatican City
Low-Level Central_and_Eastern_Europe_965_7252 (31 countries, 1,14 GB) or
Central_and_Eastern_Europe_965_7280 (31 countries, 1,02 GB)
Albania, Austria, Belarus, Bosnia und Herzegowina, Bulgaria, Croatia, Cyprus, Czech Republic, Germany, Estonia, Greece, Italy, Kosovo, Latvia, Liechtenstein, Lithunia, Malta, Macedonia, Moldavia, Montenegro, Poland, Romania, Russia, San Marino, Switserland, Serbia, Slovakia, Slovenia, Ukraine, Hungary, Vatican City
High-Level Europe_North_965_7250 (14 countries, 997 MB)
Belgium, Denmark, Estonia, Finland, Germany, Ireland, Latvia, Lithuania, Luxemburg, the Netherlands, Norway, Russia, Sweden, United Kingdom*
*Poland: NOT included. One cannot navigate from Germany to Lithuania or vice versa!High-Level Europe_South_965_7250 (21 countries, 1,23 GB)
Albania, Andorra, Bosnia und Herzegowina, Croatia, Cyprus, France, Gibraltar, Greece, Italy, Kosovo, Liechtenstein, Malta, Macedonia, Monaco, Montenegro, Portugal, San Marino, Switserland, Serbia, Slovenia, Spanien, Vatican City
High-Level Europe_West_965_7250 (11 countries, 1,21 GB)
Austria, Belgium, France, Germany, Ireland, Liechtenstein, Luxemburg, Monaco, the Netherlands, Switserland, United Kingdom
High-Level Europe_East_965_7250 (27 countries, 813 MB)
Austria, Albania, Belarus, Bosnia und Herzegowina, Bulgaria, Croatia, Cyprus, Czech Republic, Estonia, Finland, Greece, Hungary, Kosovo, Latvia, Lithuania, Macedonia, Moldova, Montenegro, Poland, Romania, Russia, Serbia, Slovakia, Slovenia, Turkey, Ukraine, Vatican City
Low-Level Europe_East_965_7280 (39 countries, 1,74 GB)
Albania, Austria, Belgium, Belarus, Bosnia und Herzegowina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Germany, Greece, Hungary, Italy, Kosovo, Latvia, Liechtenstein, Lithuania, Luxemburg, Malta, Macedonia, Moldova, Montenegro, the Netherlands, Norway, Poland, Romania, Russia, San Marino, Sweden, Switserland, Serbia, Slovakia, Slovenia, Turkey, Ukraine, Vatican City
I can't imagine anybody thinking this is an improvement in any way. This is a mess!