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Showing content from https://github.com/dotnet/reactive/issues/2112 below:

Union doesn't dispose enumerator for empty lists · Issue #2112 · dotnet/reactive · GitHub

UnionAsyncIterator has the same issue as reported for UnionIterator and fixed in .NET 5. It seems as simple as moving the call to SetEnumeratorAsync up just before the if.

++_index; var enumerator = enumerable.GetAsyncEnumerator(_cancellationToken); if (await enumerator.MoveNextAsync().ConfigureAwait(false)) { await SetEnumeratorAsync(enumerator).ConfigureAwait(false); StoreFirst();

vs

        IEnumerator<TSource> enumerator = enumerable.GetEnumerator();
        SetEnumerator(enumerator);
        
        ++_state;
        if (enumerator.MoveNext())
        {
            StoreFirst();

(source: https://github.com/dotnet/runtime/blob/714a4420805ed53c311b05381c83c88894100fa9/src/libraries/System.Linq/src/System/Linq/Union.cs#L172-L178)

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