JUnit attachments plugin cannot be used inside a 'Flexible publish' step

The 'Publish test attachments' checkbox will not be saved if one uses the 'Publish JUnit test result report' action inside a 'Flexible publish' plugin conditional action.

Notes

• enabling the JUnit attachments plugin in a plain post-build step works out OK
• adding the respective elements to the config.xml of the respective job and reloading the configuration from disk is working as well
• saving the configuration of the manually enabled JUnit attachments step (inside 'flexible publish') will disable it again