assembly:attach wrongly renames/overwrites assemblies to the primary artifact

I've configure the assembly plugin in my project like so:
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<finalName>$

-$

</finalName>
<descriptors>
<descriptor>assembly.xml</descriptor>
</descriptors>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
<executions>
<execution>
<id>make-assembly</id><!-- this is used for inheritance merges -->
<phase>package</phase><!-- append to the packaging phase. -->
<goals>
<goal>attached</goal><!-- goals == mojos -->
</goals>
</execution>
</executions>
</plugin>

Note, that my project is producing a JAR artifact in addition to the zip/tar.gz artifacts produced by the assembly plugin. However, the assembly plugin in beta-2 feels the need to make the zip assembly the primary assembly and make it a jar!

[INFO] [install:install]
[INFO] Installing c:\workspaces\cxf\workspace\mule-transport-restlet\target\mule-transport-restlet-1.0-SNAPSHOT.zip to c:\repo\org\mule\transports\mule-transport-restlet\1.0-SNAPSHOT\mule-transport-restlet-1.0-SNAPSHOT.jar
[INFO] [deploy:deploy]
altDeploymentRepository = null
[INFO] Retrieving previous build number from muleforge.webdav.snapshots
Uploading: https://dav.muleforge.org/snapshots.repository/restlet//org/mule/transports/mule-transport-restlet/1.0-SNAPSHOT/mule-transport-restlet-1.0-20080321.175727-2.jar

During that last line Maven is uploading the zip as the jar!

Reverting back to 2.2-beta-1 fixies this.