Custom fields are wrongly encoded in XML view under Orion

Custom fields names are incorrectly encoded while with standard fields everyting is OK. See the sample below, assignee value is encoded correctly while customfield_10040 is not.
Everything is also ok if one of the following conditions is met:
1) JIRA is working under Tomcat 4.1.30;
2) General Options/Encoding is set to UTF-8;

============
<?xml version="1.0" encoding="windows-1251" ?>

• <!-- RSS generated by JIRA 72 at Wed Nov 10 13:41:38 NOVT 2004
  -->
  ...
  <assignee username="admin">Администратор</assignee>
  <reporter username="admin">Администратор</reporter>
  <created>Wed, 6 Oct 2004 17:20:23 +0700 (NOVST)</created>
  <updated>Wed, 10 Nov 2004 13:31:09 +0600 (NOVT)</updated>
  <due />
  <votes>0</votes>
• <comments>
  <comment author="admin" created="Thu, 14 Oct 2004 00:00:30 +0700 (NOVST)" level="">aaa</comment>
  </comments>
• <customfields>
• <customfield id="customfield_10040" key="com.atlassian.jira.plugin.system.customfieldtypes:textfield">
  <customfieldname>Р'РѕСЃРїСЂРѕРёР- ведение</customfieldname>
• <customfieldvalues>
  <customfieldvalue>Проблема РЅРµ требует РІРѕСЃРїСЂРѕРёР- ведения</customfieldvalue>
  </customfieldvalues>
  </customfield>
  </customfields>