roman font can't display some chars

Some chars can't be displayed in roman font (texmacs
computer modern), it can be displayed in other fonts like
STIX.  This bugs happens in trunk version, 1.99.5, 1.0.7.21.


<TeXmacs|1.99.5>

<style|generic>

<\body>
  \<epsilon\> \<vartheta\> \<varpi\> \<varrho\> \<#3F5\>
</body>

<initial|<\collection>
</collection>>