Unable to delete a Task from EWS after copying to mailbox (5.2.0)

I read an IPM.Task from disk and copied it to a mailbox.  Later, I tried to programmatically delete it and I receive an exception:

DeleteMessage failed. Response Code: ErrorAffectedTaskOccurrencesRequired, MessageText: AffectedTaskOccurrences attribute is required for Task items

I tried to narrow it down to see exactly what might be the cause but I am at a loss.  It might be something with the Task itself, but I'll need to know what to do to repair it in the future.

I'm attaching a sample Task and some source code to duplicate the issue.