The below repo with turned on `snappy` compression:

          var m = new MongoClient("mongodb://localhost?compressors=snappy");
          var coll = m.GetDatabase("test").GetCollection<BsonDocument>("foo");
          coll.InsertOne(BsonDocument.Parse("{x:1}"));

throws the server exception:

DBException handling request, closing client connection: BadValue: Compressed message was invalid or corrupted

Probably it's something about the difference in the format of `snappy` headers which are expected by the server and format which we use in the driver.

NOTE: currently `snappy` is disabled in `evergreen.yml`. It should be turned on. However when I did it, all tests related to `snappy` task passed: https://evergreen.mongodb.com/version/5d3ebf440ae6067c15be8da9
Perhaps it's not enough just to uncomment the snappy lines from here: https://github.com/mongodb/mongo-csharp-driver/blob/master/evergreen/evergreen.yml#L483. It should be also investigated.