BPMN21 — BPMN2 issue: Example (DI lanes and nested lanes) appears to be invalid

When opening the example
http://www.omg.org/spec/BPMN/2.0/examples/ZIP/Diagram%20Interchange/Examples%20-%20DI%20-%20Lanes%20and%20Nested%20Lanes.bpmn
throws an exception[1].

This happens because it tries to assign
org.eclipse.bpmn2.impl.DataObjectReferenceImpl object to an array of FlowNodes.

org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Value
'org.eclipse.bpmn2.impl.DataObjectReferenceImpl@6caf4065 (id:
DataObject_Document, anyAttribute: null) (name: Document)' is not legal.
(platform:/resource/Dev/Examples%20-%20DI%20-%20Lanes%20and%20Nested%20Lanes.bpmn2,
-1, -1)
at
org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.handleErrors(XMLLoadImpl.java:83)
at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:191)
at
org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:180)
at
org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1494)
at
org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1282)
...
Caused by: org.eclipse.emf.ecore.xmi.IllegalValueException: Value
'org.eclipse.bpmn2.impl.DataObjectReferenceImpl@6caf4065 (id:
DataObject_Document, anyAttribute: null) (name: Document)' is not legal.
(platform:/resource/Dev/Examples%20-%20DI%20-%20Lanes%20and%20Nested%20Lanes.bpmn2,
-1, -1)
at
org.eclipse.emf.ecore.xmi.impl.XMLHandler.setFeatureValue(XMLHandler.java:2663)
at
org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleForwardReferences(XMLHandler.java:1149)
...
Caused by: java.lang.ArrayStoreException:
org.eclipse.bpmn2.impl.DataObjectReferenceImpl
at org.eclipse.emf.common.util.BasicEList.assign(BasicEList.java:124)
at org.eclipse.emf.common.util.BasicEList.addUnique(BasicEList.java:424)
at
org.eclipse.emf.common.notify.impl.NotifyingListImpl.doAddUnique(NotifyingListImpl.java:331)
at
org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:315)
at
org.eclipse.emf.ecore.xmi.impl.XMLHelperImpl.setValue(XMLHelperImpl.java:1179)
at
org.eclipse.emf.ecore.xmi.impl.XMLHandler.setFeatureValue(XMLHandler.java:2658)
... 99 more