Problem with GraphQL.Client.Abstractions

Hi

I have problem with GraphQL.Client.Abstractions. I have portal with graphQL answer from portal to my request looks:

```
{
"data": {
"pages": {
"single": {
"title": "Tworzenie backup",
"id": 5,
"path": "database/backup"
}
}
}
}
```
When I use

`var answer_request = await graphQLClient.SendMutationAsync(request);`

where T is class -> DataPageSearch
```
public class DataPageSearch
{
public Pages Pages { get; set; }
}

public class Pages
{
public Search Single{ get; set; }
}

public class Single
{
public List Results { get; set; }
}

public class Result
{
public string id { get; set; }
public string path { get; set; }
public string title { get; set; }
}
```
it's evrything ok. But when i try use GraphQL.Client.Abstractions and

`var answer_request = await graphQLClient.SendMutationAsync(request, () => new {list = new Single()});`

always i get null. Where is problem. Thanks.