Corrupted zip created by assembly: extracting the zip forgets certain folders (or throws permission denied errors) possibly because zip index is corrupted

Take a look at the attached zip created by the assembly plugin.

• If you open it, you can see navigate to the submap /droolsjbpm-integration-distribution-5.2.0.M2/reference_manual/pdf/. In that map you find the file droolsjbpm-integration-docs.pdf which you can open with a PDF reader.
• If instead you extract the entire archive to a directory, and navigate to the submap /droolsjbpm-integration-distribution-5.2.0.M2/reference_manual/pdf/, you 'll find that that map is unreadable (chmod 000) and the pdf file is gone.
  The directories html_single and html suffer the same fate, but none of the other directories do.

I used the default linux Ubuntu 10.10 archive manager (which according to about screen is called "File-roller 2.32.0").
I used Maven 3.0.3, maven-assembly-plugin 2.2.1.
Note that that attached zip is gutted to stay inside the maximum file upload size.

Possible reproduce recipe:

git clone git@github.com:droolsjbpm/droolsjbpm-integration.git
cd droolsjbpm-integration
git checkout 5.2.0.M2
mvn clean install -DskipTests -Dfull
cd droolsjbpm-integration/target
ls

checkdir error:  cannot create /home/gdesmet/tmp/releases/problem_with_the_release_zip/droolsjbpm-integration-distribution-5.2.0.M2/reference_manual/html_single/images
                 Permission denied
                 unable to process droolsjbpm-integration-distribution-5.2.0.M2/reference_manual/html_single/images/.
...