Cannot use a BoundaryEvent inside an embedded SubProcess in business-central jBPM Designer

Issue

• I drag&drop "Catching Intermediate Event" Timer to the edge of a User Task inside MultipleInstances subprocess in jBPM Designer but it's not recognized as a boundary timer.
• I tried to model a boundary error event to a User Task inside an embedded subprocess in jBPM Designer but it doesn't become a boundary error event.