Masstransit with RabbitMQ using .net creates 2 Exchanges for given Type

Below is a sample POC developed in ASP.net Core 6.0 API that uses MassTransit and RabbitMQ to simulate a simple publish/subscribe using MassTransit consumer. However when the code is executed it results in creation of 2 Exchanges and 1 Queue in RabbitMQ.

Program.cs

builder.Services.AddMassTransit(msConfig =>
{
    msConfig.AddConsumers(Assembly.GetEntryAssembly());

    msConfig.UsingRabbitMq((hostcontext, cfg) =>
    {
        cfg.Host("localhost", 5700, "/", h =>
        {

           h.Username("XXXXXXXXXXX");
           h.Password("XXXXXXXXXXX");

        });

        cfg.ConfigureEndpoints(hostcontext);
    });
});

OrderConsumer.cs

public class OrderConsumer : IConsumer<OrderDetails>
{
    readonly ILogger<OrderConsumer> _logger;
    public OrderConsumer(ILogger<OrderConsumer> logger)
    {
        _logger = logger;
    }

    public Task Consume(ConsumeContext<OrderDetails> context)
    {
        _logger.LogInformation("Message picked by OrderConsumer. OrderId : {OrderId}", context.Message.OrderId);

        return Task.CompletedTask;
    }
}

Model

    public class OrderDetails
{
    public int OrderId { get; set; }
    public string OrderName { get; set; }
    public int Quantity { get; set; }
}

Controller

    readonly IPublishEndpoint _publishEndpoint;

    [HttpPost("PostOrder")]
    public async Task<ActionResult> PostOrder(OrderDetails orderDetails)
    {
        await _publishEndpoint.Publish<OrderDetails>(orderDetails);

        return Ok();
    }

Output from Asp.Net

As highlighted 2 Exchanges are created Sample:OrderDetails and Order.

However, the Sample:OrderDetails is bound to Order (Exchange)

And the Order (Exchange) routes to "Order" queue.

So, the question is regarding the 2 Exchanges that got created where I am not sure if that's per design or its a mistake on the code that led to both getting created and if its per design, why the need for 2 exchange.