mvn assembly:assembly fails to replace ${parent.parent.version}

I have a multi module project with the following structure:

parent
    dev
       jar1
       war

In the jar1 project there's a file with the following expression:

${parent.parent.version}

This expression is being correctly replaced by the project's version when I run clean install, but when I run assembly:assembly, the expression remains as is. The file is filtered in the resources declarartion of the pom.xml

Any ideas about what can be the cause of this?
Thanks.