Important information about a bug in scheduled tasks

using System.Globalization;
using DeployToAzureDemo.Models.Pages;
using EPiServer;
using EPiServer.Core;
using EPiServer.DataAbstraction;
using EPiServer.Filters;
using EPiServer.PlugIn;
using EPiServer.ServiceLocation;
using EPiServer.Web;

namespace DeployToAzureDemo.Business
{
    [ScheduledPlugIn(DisplayName = "[Testjob] Count All Pages", Description = "Get all pages below startpage and count them")]
    public class CountAllPages
    {
        public static string Execute()
        {
            var iContentTypeRepository = ServiceLocator.Current.GetInstance<IContentTypeRepository>();

            var pagePageTypeId = iContentTypeRepository.Load<NewsPage>();

            var propertyCriteriaCollection = new PropertyCriteriaCollection
            {
                new PropertyCriteria
                {
                    Condition = CompareCondition.Equal, 
                    Name = "PageTypeID", 
                    Type = PropertyDataType.PageType, 
                    Value = pagePageTypeId.ID.ToString(CultureInfo.InvariantCulture), 
                    Required = true
                }
            };

            var pagesOfCorrectType = DataFactory.Instance.FindPagesWithCriteria(new PageReference(SiteDefinition.Current.StartPage.ID),propertyCriteriaCollection);



            return string.Format("There are {0} number of pages with the pagetype: {1} below startpage", pagesOfCorrectType.Count, pagePageTypeId.Name);
        }
    }
}

Declare @ID varchar(50)

Select @ID = pkId
From [dbo].[tblScheduledItem]
Where [Name] = '[Testjob] Count All Pages'

Select *
From [dbo].[tblScheduledItem]
Where pkID = @ID

Select top 20 *
From [dbo].[tblScheduledItemLog]
Where fkScheduledItemId = @ID
Order by 1 desc

Declare @ID varchar(50)

Select @ID = pkId
From [dbo].[tblScheduledItem]
Where [Name] = '[Testjob] Count All Pages'

Delete from [tblScheduledItemLog]
Where fkScheduledItemId = @ID

Delete from [tblScheduledItem]
Where pkID = @ID