I browse the management model for an EAR file with two subdeployments (EJB jar and Web WAR).

First I expand the EJB jar ("subsystem" => "ejb3") - screenshot "hal1.png"
Then I click the Web war and expand the node "subsystem": the details from the EJB jar are displayed - screenshot "hal2.png"
After a click on "refresh", everything is fine again - screenshot "hal3.png"

I can provide the sample EAR if required.