Desktop Shape Map doesn't show Belgium

Hi Community,

I've got the following issue. We are using the Desktop Shape Map Visual to present values according to different countries. As country codes we use the ISO-3166 ALPHA 3 abbreviations. 

All countries, apart from Belgium, are also displayed correctly in this way. Only Belgium is not displayed at all. If we change the abbreviation for Belgium from the 3-digit abbreviation 'BEL' to the 2-digit abbreviation 'BE', Belgium is also displayed correctly.

Is this a known issue or a bug of the map?
I would be very pleased to receive any information.

Thanks in advance

Liam