Thanks for reporting the issue. You are correct- the Code Converter does not handle automatic properties very well. This is a problem in the root coversion engine, NRefactory. In fact, you verfiy this by running your conversion the SharpDevelop converter (the people that work on building NRefactory):
I'd suggest sending the feedback via the NRefactory bug reporting forum, which is located here:
Hopefully that helps. I apologize that the converter cannot handle this new C# feature. Hopefully the NRefactory project will be able to find a way to support automatic properties in the future!