Qualified and unqualified actifact does not resolve dependencies identically

>mvn org.codehaus.mojo:dashboard-maven-plugin:1.0.0-beta-1:dashboard
and
>mvn dashboard:dashboard

executions does not output same things :
First output :
Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.

Second output :
No error

This is not a plugin dependant issue, but a maven one.The dependencies are not resolved the same way.

Qualified as blocker since we are using two different dashbord plugins :
"org.codehaus.mojo:dashboard-maven-plugin" and "com.xebia.mojo:maven-dashboard-plugin"

So we need the qualified name to differenciate them, and also fails our site generation.
As attachment the two outputs in debug mode for offline and not offline versions and the pom to reproduce the error.
You'll see the "commons-logging:commons-logging:jar:1.1:compile" line in the "[DEBUG] Plugin dependencies for:" section, present in the unqualified output, but not in qualified output for offline/online version.