Python: Using .Net agent framework client to connect to DevUI Responses REST API (python)

We have setup a python DevUI server, and we are trying to connect to the Responses REST API on this server using a .Net client (agent framework).
The problem we noticed is that the python server serializes the "created_at" property as a fractional number in the Json response, and the .Net client gives a FormatException when trying to deserialize that value to a DateTimeOffset property.

We invoke the DevUI python server agent by creating an OpenAIClient object in .Net, then invoking the GetResponsesClient() method and then the CreateAIAgent method.

var client = new OpenAIClient(new ApiKeyCredential("dummy"), , new OpenAIClientOptions() { Endpoint = uri });
var responseClient = client.GetResponsesClient("devui");
var chatOptions = new ChatOptions()
{
  RawRepresentationFactory = _ => new CreateResponseOptions()
  {

    Metadata =
    {
        { "entity_id", name }
    }
  }
};
var agent = responseClient.CreateAIAgent(new ChatClientAgentOptions() { Name = name, ChatOptions = chatOptions }, loggerFactory: sp.GetRequiredService<ILoggerFactory>())

agent.RunAsync(...); // A FormatException is thrown

This is an example of the response produced by the DevUI python server:

{"id":"resp_dad8beaf1b7a","created_at":1766440374.769623,"error":null,"incomplete_details":null,"instructions":null,"metadata":null,"model":"devui","object":"response","output":[{"id":"msg_dcd66945","content":[{"annotations":[],"text":"Here’s what I have ...

We have managed to workaround this issue by creating a DelegatingHandler to inspect the response and convert the fractional number (created_at property) to an integer before the Json response gets deserialized.

Is there a better way to deal with this situation? Is this an issue that needs to be fixed in the code?

Thanks!