Ant task / element <fx:fileset requiredFor="preloader"> doesn't create appropriate value in generated JNLP file

I'm expecting the <fx:fileset requiredFor="preloader"> element to result in <jar href="client-preloader-0.1-SNAPSHOT.jar" size="145045" download="progress"/> in the JNLP file. Instead a value of "eager" is set in the download attribute.

This expectation is based upon the documentation of the <fx:fileset> found here: http://docs.oracle.com/javafx/2/deployment/javafx_ant_task_reference002.htm#CIAIHFGI

{code}
<target xmlns:fx="javafx:com.sun.javafx.tools.ant">
<taskdef
uri="javafx:com.sun.javafx.tools.ant"
resource="com/sun/javafx/tools/ant/antlib.xml"
classpath="${javafx.tools.ant.jar}"/>

<fx:application id="fxApp"
name="${project.name}"
mainClass="${exec.mainClass}"
preloaderClass="com.preloader.MyPreloader">
<param name="app.version" value="${project.parent.version}"/>
<param name="app.name" value="${app.name}"/>
</fx:application>
<fx:jar destfile="${javafx-launcher-dir}/client-${project.parent.version}-launcher">
<fx:application refid="fxApp"/>
<fileset dir="${unpcked-cc-dir}"/>
<fx:resources>
<fx:fileset dir="${dep-dir}" includes="*.jar" excludes="client-preloader*.jar" requiredFor="startup"/>
<fx:fileset dir="${dep-dir}" includes="client-preloader*.jar" requiredFor="preloader"/>
</fx:resources>
</fx:jar>
...
</target>

{code}