SXA Rendering Exception Handler

CustomPublishModeRenderingErrorStrategy.cs

using Microsoft.Extensions.DependencyInjection;
using Sitecore;
using Sitecore.Abstractions;
using Sitecore.DependencyInjection;
using Sitecore.Diagnostics;
using Sitecore.Mvc.Pipelines.Response.RenderRendering;
using Sitecore.Mvc.Presentation;
using Sitecore.XA.Foundation.Abstractions.Configuration;
using Sitecore.XA.Foundation.Multisite.Extensions;
using Sitecore.XA.Foundation.Presentation;
using System;
using System.IO;
using System.Web.Mvc;

namespace SCBasics.Foundation.SitecoreExtensions.Pipelines.RenderRendering
{
    public class CustomPublishModeRenderingErrorStrategy : PageModeRenderingErrorStrategy, IRendererErrorStrategy
    {
        private readonly BaseLog _log;

        public CustomPublishModeRenderingErrorStrategy(BaseLog log)
        {
            _log = log;
        }
        protected override string GetExceptionDetails(string prefix, string message, string stackTrace)
        {
            string pageModeRenderingErrorClass = ServiceProviderServiceExtensions.GetService<IConfiguration<PresentationConfiguration>>(ServiceLocator.ServiceProvider).GetConfiguration().PageModeRenderingErrorClass;
            
            return this.GetPreCode(stackTrace);
        }

        public bool HandleError(Renderer renderer, Exception ex, TextWriter writer)
        {
            bool isCustomErrorHandlerEnabled = Sitecore.Configuration.Settings.GetBoolSetting("SCBasics.IsCustomErrorEnabled", true);
            if (!isCustomErrorHandlerEnabled)
                return false;

            /*
             * Sitecore.XA.Foundation.Presentation.Pipelines.RenderRendering.SxaPageModeRenderingErrorStrategy 
             * NON SXA References:
             * https://www.teamdevelopmentforsitecore.com/Blog/robust-mvc-rendering-exception-handler
             * https://www.sitecorenutsbolts.net/2015/10/23/Rendering-Exception-Handling-The-Right-Way/
             */
            if (this.IsPageModeNormal())
            {
                return PublishModeHandleError(renderer, ex, writer);
            }
            if (!Context.Site.IsSxaSite())
            {
                return false;
            }
            return base.HandleError(renderer, ex, writer);
        }

        private bool PublishModeHandleError(Renderer renderer, Exception ex, TextWriter writer)
        {
            Assert.IsNotNull(renderer, "renderer");
            Assert.IsNotNull(ex, "ex");
            Assert.IsNotNull(writer, "writer");
            if (!this.IsPageModeNormal())
            {
                return false;
            }

            string prefix = string.Format("Error Rendering {0}: ", renderer);
            string str3 = this.GetExceptionDetails(prefix, ex.Message, ex.StackTrace);

            // Log Error
            _log.Error(string.Format("Failed to render component '{0}'", prefix), ex, this);

            // Log main error in comment
            writer.WriteLine("<!-- Exception rendering component '{0}': {1} -->",
                        prefix + ":" + ex.Message,
                        str3);

            // Log Inner exception in comment
            Exception innerException = ex.InnerException;
            string str2 = "Inner Exception: ";
            while (innerException != null)
            {
                string str4 = this.GetExceptionDetails(str2, innerException.Message, innerException.StackTrace);
                writer.WriteLine("<!-- Inner Exception: {0} -->", innerException.Message);
                innerException = innerException.InnerException;
            }


            return true;
        }
    }
}

SCBasics.Foundation.SitecoreExtensions.CustomErrorHandler.config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>
      <!--Default true-->
      <setting name="SCBasics.IsCustomErrorEnabled" value="true"/>

      <!--   USE SERVER-SIDE REDIRECT FOR REQUEST ERRORS
            If true, Sitecore will use Server.Transfer instead of Response.Redirect to redirect request to service pages
            when an error occurs (item not found, access denied etc).
            Default value: false
       -->
      <setting name="RequestErrors.UseServerSideRedirect" value="true"/>
    </settings>
    <pipelines>
      <mvc.renderRendering>       
        <processor type="Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer, Sitecore.Mvc">
          <param desc="rendererErrorHandler" type="Sitecore.Mvc.Pipelines.Response.RenderRendering.HttpExceptionWrappingRendererErrorStrategy, Sitecore.Mvc">
            <param desc="rendererErrorHandler" type="Sitecore.Mvc.Pipelines.Response.RenderRendering.ChainedRendererErrorStrategy, Sitecore.Mvc">
              <Handlers hint="list">
                <handler patch:after="*[@type='Sitecore.XA.Foundation.Presentation.Pipelines.RenderRendering.SxaPageModeRenderingErrorStrategy, 
                         Sitecore.XA.Foundation.Presentation']" 
                         type="SCBasics.Foundation.SitecoreExtensions.Pipelines.RenderRendering.CustomPublishModeRenderingErrorStrategy, 
                         SCBasics.Foundation.SitecoreExtensions" resolve="true"/>
              </Handlers>
            </param>
          </param>
        </processor>
      </mvc.renderRendering>
    </pipelines>
  </sitecore>
</configuration>

i can't seem to get the processor to fire. i'm using 9.3. here is my showconfig .

here is the implementation class:

what am i missing?
thanks for you feedback,
marcos.