-Darguments ignored with InvokerMavenExecutor

I recently upgraded a build to use maven-release-plugin 2.0-beta-9 (from beta-7) and found my use of -Darguments="-f other-pom.xml" no longer worked.

I found I was able to work around this by using -DmavenExecutorId=forked-path.

I feel it is unwise to break existing builds by switching implementations whilst the new implementation is incomplete, and would urge that greater importance be placed on backwards compatibility.