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Created attachment 4685 [details]
This was discovered using Xamarin.Android 4.8.1 with Mono 3.2. When you use the SaveOptions.OmitDuplicateNamespaces flag with System.Xml.Linq.XElement.Save it actually causes every xmlns attribute to be duplicated, like so:
<element xmlns="foo" xmlns="foo" />
This causes parsing (using a XmlReader) to fail with a System.Xml.XmlException: "Attribute name and qualified name must be identical."
To reproduce this run the attached android project and click the button. You will get an exception. If you comment out the line setting the OmitDuplicateNamespaces flag then the crash will go away. The application also prints out the modified XML so you can see how it is being corrupted.
Now System.Xml.Linq is based on referencesource this does not reproduce anymore.