Report Finance comma se

When I use this settings ( comma separated for Decimal and point for Thousand separeted) the export doesn't work

because don't respect the requirements, infact export always with 3 digit after the comma

SET ThousandSep='.'; SET DecimalSep=',';

But all works when I use the reverse case ( comma separated for Thousand and point for Decimal )

SET ThousandSep=','; SET DecimalSep='.';

Can you tell me how to fix it or is it a bug?

In attach the example