Use GuidRepresentation.Standard with MongoDB

I am implementing a custom IBsonSerializer with the official MongoDB driver (C#). I am in the situation where I must serialize and deserialize a Guid.

If I implement the Serialize method as follow, it works:

public void Serialize(BsonWriter bsonWriter, Type nominalType, object value, IBsonSerializationOptions options)
{
    BsonBinaryData data = new BsonBinaryData(value, GuidRepresentation.CSharpLegacy);
    bsonWriter.WriteBinaryData(data);
}

However I don't want the Guid representation to be CSharpLegacy, I want to use the standard representation. But if I change the Guid representation in that code, I get the following error:

MongoDB.Bson.BsonSerializationException: The GuidRepresentation for the writer is CSharpLegacy, which requires the subType argument to be UuidLegacy, not UuidStandard.

How do I serialize a Guid value using the standard representation?