I just piped the diagram through BPMN 2.0 schema validation. It fails to validate and there is nothing much we can do about it. The validator reported the following issues:
[warning] SchemaLocation: schemaLocation value = 'schemaLocation http://www.omg.org/spec/BPMN/20100524/MODEL schemas/BPMN20.xsd' must have even number of URI's.
[error] cvc-complex-type.2.4.a: Invalid content was found starting with element 'di:waypoint'. One of '{"http://www.omg.org/spec/DD/20100524/DI":extension, "http://www.omg.org/spec/DD/20100524/DI":waypoint}' is expected.
The reported error relates to the import error you are seeing: Unparsable content <di:waypoint> detected.