MissingKeyException on Update

[aguahombre]

I'm getting a MissingKeyException
1 is missing from previous value on update. Object type MyType, Key type System.Int32, Group key type System.String

This occurs using a SourceCache<MyType, int> when using Group.
I have a application that receives a updates of arrays of MyType which should replace the previous set of data.

The exception arises when the source data has duplicate keys that will be grouped into different groups.
I can solve the problem by removing duplicates using DistinctBy on the source data but I was expecting this to work without pre-filtering.

Here is a simplified program that exhibits the problem on DynamicData 7.4.1

    class Program
    {
        static void Main(string[] args)
        {
            SourceCache<Mytype, int> cache = new(x => x.Key);
            List<Mytype> listWithDuplicates = new() 
            { 
                new(1, "G1"), 
                new(1, "G2"),
            };
            cache
                .Connect()
                .Group(x => x.Grouping)
                .Subscribe();

            cache.Edit(x =>
            {
                x.AddOrUpdate(listWithDuplicates);
                x.Clear();
                x.AddOrUpdate(listWithDuplicates);
            });
        }
    }

    class Mytype
    {
        public Mytype(int key, string grouping)
        {
            Key = key;
            Grouping = grouping;
        }

        public int Key { get; set; }
        public string Grouping { get; set; }

        public override string ToString() => $"{Key}, {Grouping}";
    }

[RolandPheasant]

This is another issue which sailed by me when it was raised.

You're right, it should just work and thanks for the replication.

[github-actions]

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