We added simple macro for button and made it available for RTE. In the ContentPublishedNotification event we're making some custom code to push data to Redis etc and we're getting values for different properties for published content. The same code is used for returning JSON for rendering page and in event. Only in the second one it's throwing errors.

    public Dictionary<string, object> Map(IPublishedContent 
          publishedContent, GlobalSettings globalSettings)
    {
        using var context = _contextFactory.EnsureUmbracoContext();

        var properties = publishedContent.Properties
            .ToDictionary(x => x.Alias, x =>
            {
                try
                {
                    return x.GetValue();
                }
                catch (Exception e)
                {
                    Console.WriteLine(e);
                    throw;
                }
            });

        foreach (var blockModuleAlias in _blockModuleAliases)
        {
            properties = _blockListMapper.Map(properties, blockModuleAlias);
        }

        SetBreadcrumbs(publishedContent, properties);
        SetHeaderActions(publishedContent, globalSettings, properties);

        return properties;
    }

Unfortunatelly when we're trying to get value for RTE with macro added inside we're getting following exception. It's in the x.GetValue() method.

Stack Trace:

   at Umbraco.Cms.Web.Common.Macros.MacroRenderer.<RenderAsync>d__21.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Umbraco.Cms.Web.Common.Macros.MacroRenderer.<RenderAsync>d__20.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Umbraco.Cms.Core.PropertyEditors.ValueConverters.RteMacroRenderingValueConverter.<>c__DisplayClass7_0.<RenderRteMacros>b__1(String macroAlias, Dictionary`2 macroAttributes)
   at Umbraco.Cms.Infrastructure.Macros.MacroTagParser.ParseMacros(String text, Action`1 textFoundCallback, Action`2 macroFoundCallback)
   at Umbraco.Cms.Core.PropertyEditors.ValueConverters.RteMacroRenderingValueConverter.RenderRteMacros(String source, Boolean preview)
   at Umbraco.Cms.Core.PropertyEditors.ValueConverters.RteMacroRenderingValueConverter.Convert(Object source, Boolean preview)
   at Umbraco.Cms.Core.PropertyEditors.ValueConverters.RteMacroRenderingValueConverter.ConvertIntermediateToObject(IPublishedElement owner, IPublishedPropertyType propertyType, PropertyCacheLevel referenceCacheLevel, Object inter, Boolean preview)
   at Umbraco.Cms.Core.Models.PublishedContent.PublishedPropertyType.ConvertInterToObject(IPublishedElement owner, PropertyCacheLevel referenceCacheLevel, Object inter, Boolean preview)
   at Umbraco.Cms.Core.PublishedCache.PublishedElementPropertyBase.GetValue(String culture, String segment)
   at Umbraco.Extensions.PublishedPropertyExtension.Value[T](IPublishedProperty property, IPublishedValueFallback publishedValueFallback, String culture, String segment, Fallback fallback, T defaultValue)
   at Umbraco.Extensions.PublishedElementExtensions.Value[T](IPublishedElement content, IPublishedValueFallback publishedValueFallback, String alias, String culture, String segment, Fallback fallback, T defaultValue)
   at BestInvest.Common.Models.CmsModels.Generated.FullTextBlock.get_Text() in D:\__CogWorks\___Projects\BES0180-0946\src\BestInvest.Common\Models\CmsModels\Generated\FullTextBlock.generated.cs:line 58