It seems like although the QueryTranslator works as intended, there is a problem with the Serialization Info finder when trying to process the following:

strongResult = strongCollection.Where(o => o.Name.StartsWith("Sat") == true).ToList();

If we omit the == true part, then the query works:

strongResult = strongCollection.Where(o => o.Name.StartsWith("Sat")).ToList();

Integration tests reproducing the problem can be found here:

https://github.com/Roysvork/MongoDbStartsWithBugTest

You must have an instance of MongoDb running on localhost with the default port for the tests to run, of course this can be changed easily