Memory leak in test plugin 1.8?

In a project with ~40 test classes, I was surprised to see 'maven dist-bin' fail with a

java.lang.reflect.InvocationTargetException
Exception in thread "main" java.lang.OutOfMemoryError

when running the junit test suite, even though, the tests pass when running just 'maven test'. The point is that dist-bin runs the test suite twice (once from jar:jar,once from site:generate), and it's only the second time that it fails. I can reproduce it with a simple custom goal:

<goal name="test-twice">
<attainGoal name="test:test"/>
<attainGoal name="test:test"/>
</goal>

It works by simply downgrading to test-plugin-1.7, so it's not a problem with my tests.