.NET 8

I have a Middleware that reads the request response:

    public async Task InvokeAsync(HttpContext context)
    {
        var originalBodyStream = context.Response.Body;

        using (var responseBody = new MemoryStream())
        {
            context.Response.Body = responseBody;

            await _next(context);

            context.Response.Body.Seek(0, SeekOrigin.Begin);
            var responseText = await new StreamReader(context.Response.Body).ReadToEndAsync();
            context.Response.Body.Seek(0, SeekOrigin.Begin);

            Console.WriteLine("Response Body:");
            Console.WriteLine(responseText);

            await responseBody.CopyToAsync(originalBodyStream);
        }
    }

And I made a test controller, which is similar in functionality to the real case:

        [HttpGet("sample")]
        public IActionResult GetSample()
        {
            var s = "[rn {    "id": "test",rn "id": "test"   } ]";
            return Content(s, "application/json; charset=utf-8");
        }

This controller returns the correct result:

correct result

But when I use the following line, I get an incorrect response:

        [HttpGet("sample")]
        public IActionResult GetSample()
        {
            var s = "[rn    {rn        "id": "test",rn        "tt": "213",rn        "nn": "33"rn    }rn]";
            return Content(s, "application/json; charset=utf-8");
        }

incorrect response

The response is displayed correctly in Postman
postman