If the wcmio-content-package Plugin is used to download content, you can configure different filters in the pom.xml.
I would assume those filters define, which content will be included in the downloaded content.
This works fine, if the package has not been uploaded yet. But if the package has been uploaded before (this or an older version), changes in the filter-definition of the pom.xml are ignored.
To solve this, you have to manually delete the package in crx and then rerun the plugin.