Hi @peterj,
I don’t know the correct answer to your question, but after a first glance at the ProcessDefinitionSuspensionTest.java, I found some tests that may fit to the situation you described.
Have a look by yourself here: https://github.com/camunda/camunda-bpm-platform/blob/master/engine/src/test/java/org/camunda/bpm/engine/test/api/repository/ProcessDefinitionSuspensionTest.java.
If you find your situation here, you can be quite sure that the regression is tested every time a new engine is built. If not, you can provide a pull request with this test class and start the discussion with the product team on a concrete proposal.
Hope this helps, Ingo