Font mapping unicode problem (5 digits)

General
1

Hey guys, I’m Trying to create icon classes mapping a font which uses unicodes with 5 digits such this one: http://unicode-table.com/en/1F440/

But it seems to work only with 4 digits. Is this a bug or am I doing something wrong?

  <Text ux:Class="icnLink" Font="gzm">&#x1F517;</Text> <!-- 5 digits unicode: It doesn't work -->
  <Text ux:Class="icnUnlink" Font="gzm">&#xE011;</Text> <!-- 4 digits: It works -->