BUG: XAML not rendering text at all font sizes

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   The markup control / XTP markup context does not render certain 
characters from the Chinese/Japanese/Korean alphabet at certain font 
sizes. This can be reproduced with the  Codejock MarkupPad:

Markup:

<Page
 xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>

<TextBlock Cursor="Hand" VerticalAlignment="Center" 
HorizontalAlignment="Center" FontSize="16px">Enter Text Here 
防火用</TextBlock>
</Page>

The text Enter Text Here 防火用 is visible at 12px but not at 13px. It is displayed at 14px and 15px but not at 16 px. 

You can try that out in MarkupPad easily.