In MongoDBDilacet we get the collection without passing the Writeconcern:

provider.getDatabase().getCollection( collectionName )

instead of

		WriteConcern writeConcern = getWriteConcern( tupleContext );
		provider.getDatabase().getCollection( collectionName ).withWriteConcern( writeConcern );

Same thing for ReadConcern.

I've spotted this case when we are running native queries but we should check if there are other places where it's needed