Updating other item in the custom publish pipeline not working

Question

I am trying to update an item inside custom publish pipeline in Sitecore 10.2. It does get updated once but if pipeline runs again the item is not updated.

The item update code gets executed every time but it doesn't update the field every time. Only after the apppool reset it does it once and nothing after that even if the code is executed.

Below is my pipeline code:

public class CustomCacheUpdatePublishPipeline
    {
        public void UpdatePublishingDate(object sender, EventArgs args)
        {
            var sitecoreArgs = args as Sitecore.Events.SitecoreEventArgs;
            if (sitecoreArgs == null)
                return;
            var publisher = sitecoreArgs.Parameters[0] as Publisher;
            if (publisher == null)    
                return;
            var db = Sitecore.Configuration.Factory.GetDatabase("master");
            Item item  = publisher.Options.RootItem;
            Item configurationItem = db.GetItem(Templates.CarAdvisoryConfiguration.ItemId);
            if (item != null && configurationItem != null)
            {
                ID[] templateIds = configurationItem[Templates.CarAdvisoryConfiguration.Fields.TemplateIds]?.Split('|')?.Select(x => new ID(x))?.ToArray();
                if ((templateIds?.Any() ?? false) &&
                        templateIds.Contains(item.TemplateID) || (item.Axes?.GetAncestors()?.Where(x => templateIds.Contains(x.TemplateID))?.Any() ?? false))
                {
                    using (new EditContext(configurationItem, false /*updateStatistics*/, true /*silent*/))
                    {
                        configurationItem.Fields[Templates.CarAdvisoryConfiguration.Fields.LastUpdated].Value = DateUtil.ToIsoDate(System.DateTime.Now); //this only get updated once and doesn't get updated after say 2 mins
                    }
                    Database master = Sitecore.Configuration.Factory.GetDatabase("master");
                    Database web = Sitecore.Configuration.Factory.GetDatabase("web");

                    Sitecore.Publishing.PublishOptions publishOptions = new Sitecore.Publishing.PublishOptions(master,
                                   web,
                                   Sitecore.Publishing.PublishMode.SingleItem,
                                   configurationItem.Language,
                                   System.DateTime.Now);

                    Sitecore.Publishing.Publisher publisher1 = new Sitecore.Publishing.Publisher(publishOptions);

                    publisher1.Options.RootItem = configurationItem;

                    publisher1.Options.Deep = true;

                    publisher1.Publish();
                }
            }
        }
    }

config:

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
    <sitecore>
        <events>
            <event name="publish:end">
                <handler type="RACQ.Feature.CarAdvisory.Pipelines.CustomCacheUpdatePublishPipeline, RACQ.Feature.CarAdvisory" method="UpdatePublishingDate" />
            </event>
        </events>
    </sitecore>
</configuration>

Answer 1

The problem is with this line

using (new EditContext(configurationItem, false /*updateStatistics*/, true /*silent*/))

You use true for silent which means that no events should be triggered. That also means that Sitecore will not clear its caches.

And btw, EditContext is obsolete. Just use

item.Editing.BeginEdit()
...
item.Editing.EndEdit()