As GetAsText() had no other purpose when WebForm Controls were removed, it is now replaced with the populated Text property

src/Umbraco.Web/PropertyEditors/ValueConverters/RteMacroRenderingValueConverter.cs

@@ -61,7 +61,7 @@ namespace Umbraco.Web.PropertyEditors.ValueConverters
                         macroAlias,
                         umbracoContext.PublishedRequest?.PublishedContent,
                         //needs to be explicitly casted to Dictionary<string, object>
-                        macroAttributes.ConvertTo(x => (string)x, x => x)).GetAsText()));
+                        macroAttributes.ConvertTo(x => (string)x, x => x)).Text));
 
                 return sb.ToString();
             }

src/Umbraco.Web/UmbracoComponentRenderer.cs

@@ -119,7 +119,7 @@ namespace Umbraco.Web
                 x => x.Key.ToLowerInvariant(),
                 i => (i.Value is string) ? HttpUtility.HtmlDecode(i.Value.ToString()) : i.Value);
 
-            var html = _macroRenderer.Render(alias, content, macroProps).GetAsText();
+            var html = _macroRenderer.Render(alias, content, macroProps).Text;
 
             return new HtmlString(html);
         }