public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
    {
        foreach(var entry in base.ChangeTracker.Entries<BaseDateEntity>()
            .Where(q => q.State == EntityState.Added || q.State == EntityState.Modified))
        {
            var dateTime = DateTime.Now;
            var persianCalendar = new PersianCalendar();
            var year = persianCalendar.GetYear(dateTime);
            var month = persianCalendar.GetMonth(dateTime).ToString("D2"); ;
            var day = persianCalendar.GetDayOfMonth(dateTime).ToString("D2");
            var hour = persianCalendar.GetHour(dateTime).ToString("D2"); ;
            var minute = persianCalendar.GetMinute(dateTime).ToString("D2");
         
            if (entry.State == EntityState.Added)
            {
                entry.Entity.CreatedDateTime = dateTime;
                entry.Entity.CreatedTime = $"{hour}:{minute}";
                entry.Entity.CreatedDate = int.Parse($"{year}{month}{day}");
            }
            if (entry.State == EntityState.Modified)
            {
                entry.Entity.LastModifiedDate = int.Parse($"{year}{month}{day}");
                entry.Entity.LastModifiedTime = $"{hour}:{minute}";
            }
        }

        return base.SaveChangesAsync(cancellationToken);
    }

I have overrided the Savechanges method of EFCore.It does not add the entity to the database.When I change the last line to
var res = base.SaveChangesAsync(cancellationToken).Result;
return Task.FromResult(res);
It works
What is the reason ?