EF Core 3 Has Value Generator

in the modelBUilder for an entity, I am try to have the created and modified dates be set on add and updates by a custom generator. The reason for going this path is because the DbContext that creates the models is being used a base class. This base class is being inherited by SQL Server & SQLite EFCore extensions. Because of this there should be database explicit functionality in the context. The GetDateUTC() and triggers that were originally implemented SQL Server.

modelBuilder.Entity<CommunicationSendRequest>(entity =>
            {
               ...

                entity.Property(p => p.CreatedAt).ValueGeneratedOnAdd().HasValueGenerator<CreatedAtTimeGenerator>();
                entity.Property(p => p.ModifiedAt).ValueGeneratedOnUpdate().HasValueGenerator<ModifiedAtTimeGenerator>();

            });

but what is happening on add and updates both properties always set to new values. Meaning on brand new inserts the modifiedat is set, and on updates the createdat date is set. Which removes the true created at date.

The question is are those have value generators setup correctly? Is there a way to accomplish this using the generators? In the generators I tried to also check the state an return the value only if the state was added or modified. But the state always equaled Detached.

 public class CreatedAtTimeGenerator : ValueGenerator<DateTimeOffset>
    {
        public override DateTimeOffset Next(EntityEntry entry)
        {
            if (entry == null)
            {
                throw new ArgumentNullException(nameof(entry));
            }

            return DateTimeOffset.UtcNow;
        }

        public override bool GeneratesTemporaryValues { get; }
    }
    public class ModifiedAtTimeGenerator : ValueGenerator<DateTimeOffset>
    {
        public override DateTimeOffset Next(EntityEntry entry)
        {
            if (entry == null)
            {
                throw new ArgumentNullException(nameof(entry));
            }

            return DateTimeOffset.UtcNow;
        }

        public override bool GeneratesTemporaryValues { get; }
    }