With multiple modules using the same plugin later invocations of the plugin are not initialized

In Module A I have an invocation of the antrun plugin. In module B I have another invocation of antrun but this plugin has an additional dependency on ant-contrib. If I run mvn in the root of the project I get a taskdef not found error from ant because the additional dependency is not on the classpath for the invocation in module B.

Embedded error: The following error occurred while executing this line:
/data/workspaces/workspace/MoleTracker/uberjar/build.xml:20: Could not create task or type of type: foreach.

If I run mvn -f moduleB/pom.xml it runs fine.

workaround is to configure all plugin configurations the same but this seems a tad ham fisted.

I assume this is a general fault for all plugins.