jBPM Designer doesn't allow to set a Timer Intermediate Event as Non-Interrupting while added to the boundary of AdHoc/Embedded Subprocess

Issue

• We are trying to add Timer Intermediate Event to the boundary of an Embedded Subprocess using jBPM Designer. The Is Interrupting value can be set to false, making the timer non-interrupting (dotted line) by BPMN2 standards, however when saving the process model it gets saved as an interrupting timer. We have tested it with AdHoc Subprocess and it happens with that as well.
  Can you please advice if it is a known issue or it is the only implementation (i.e. Interrupting) that we have available right now for Designer? Or are we missing anything else here?