ILogger GetCurrentClassLogger in ActionFilterAttribute only works with usage in constructor

Question

I would like to log the body for some requests in my API and have created an ActionFilterAttribute for this purpose. Therefore, I created a simple TypeFilterAttribute which calls my ActionFilterAttribute in it. Locally everything works fine, but when I deploy it nothing is logged unless I call the ILogger once in the constructor. Correct, I need to use the ILogger once in the RequestLoggerService in the constructor, then everything works.

Why do I need to call the ILogger in the constructor for logging to work?

I deliberately do not want to use the ILogger as a static variable like:

private static readonly Logger _log = LogManager.GetCurrentClassLogger();

The reason is the simplified overloading of the ILogger in UnitTests.

Simplified, my code looks like this:

Example of controller:

[NoAuthorization]
[HttpPost("response")]
[RequestLogger(true, true)]
public IActionResult PostResponse([FromBody] StringRequestModel model)
{
    return Ok($"Received Message: '{model.Message}' at {DateTime.UtcNow.ToShortDateString()} - {DateTime.UtcNow.ToLongTimeString()} UTC");
}

My RequestLoggerAttribute:

public class RequestLoggerAttribute : TypeFilterAttribute
{
    public RequestLoggerAttribute(bool logBody = false, bool logHeader = false) : base(typeof(RequestLoggerService))
    {
        Arguments = new object[] { logBody, logHeader };
    }
}

My RequestLoggerService:

public class RequestLoggerService : ActionFilterAttribute
{
    private readonly bool _logHeader;

    private readonly bool _logBody;

    public ILogger _logger = LogManager.GetCurrentClassLogger();

    public RequestLoggerService(bool logBody, bool logHeader)
    {
        _logHeader = logHeader;
        _logBody = logBody;
        // Why do I need this line?
        _logger.Info($"{nameof(RequestLoggerService)} called.");
    }

    public override async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
    {
      // log HttpContext header
      _logger.Info($"requestHeaders: {requestHeadersText}");
      // log HttpContext body
      _logger.Info($"requestBody: {requestBodyText}");
    }
}