If key is set which means record is exist otherwise its Added
To decide IsKeySet we look :

public virtual (bool IsGenerated, bool IsSet) IsKeySet
        {
            get
            {
                var isGenerated = false;
                var keyProperties = ((EntityType)EntityType).FindPrimaryKey().Properties;

                // ReSharper disable once ForCanBeConvertedToForeach
                // ReSharper disable once LoopCanBeConvertedToQuery
                for (var i = 0; i < keyProperties.Count; i++)
                {
                    var keyProperty = keyProperties[i];
                    var keyGenerated = keyProperty.ValueGenerated == ValueGenerated.OnAdd;

                    if ((HasTemporaryValue(keyProperty)
                            || HasDefaultValue(keyProperty))
                        && (keyGenerated || keyProperty.IsForeignKey()))
                    {
                        return (true, false);
                    }

                    if (keyGenerated)
                    {
                        isGenerated = true;
                    }
                }

                return (isGenerated, true);
            }
        }

could you elaborate the problem?
FK default value = CLR default value or user-defined default value (like default value on principal record)

I think I should start writing test to see problem. what do you think? @AndriySvyryd @ajcvickers

Entity attached as Added when identifying FK has default value #23226

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AndriySvyrydopenedon Nov 6, 2020

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AndriySvyryd
openedon Nov 6, 2020