How to reproduce :

• override the template "common-service-body-nonempty-content-title template of the service width this code :

  <!-- Used in common.xsl --> 
      <xsl:template name="common-service-body-nonempty-content-title">
          <xsl:call-template name="rss"/>
      
          <xsl:call-template name="common-service-body-nonempty-content-title-content">
              <xsl:with-param name="title" select="$service-title"/>
              <xsl:with-param name="default-title"><i18n:text i18n:key="SERVICE_FILTERED_CONTENTS_XSLT_FILES_ZOOM_LIST_LABEL" i18n:catalogue="skin.{$skin}"/></xsl:with-param>
          </xsl:call-template>    
      </xsl:template>

• then add the filtered content service in a page without service title
  > the service should display the default title difined in the template, but it is not the case : the title is empty.