Incorrect "Nullability doesn't match the target delegate" when tuple element names don't explicitly match

Version Used: 17.11.0 Preview 3.0

The following code erroneously causes this warning to appear for each lambda in the Error List and at the command line, though squiggles are not shown:

⚠️ CS8621 Nullability of reference types in return type of 'lambda expression' doesn't match the target delegate 'Func<(string, object?), ?>' (possibly because of nullability attributes).

class C
{
    void M((string Name, object? Value)[] parameters)
    {
        _ = parameters.Append(("A", "A")).ToDictionary(
            tuple => tuple.Name,
            tuple => tuple.Value);
    }
}

If you name the elements in the tuple expression to exactly match the tuple element names in the collection, the warning goes away.

class C
{
    void M((string Name, object? Value)[] parameters)
    {
        _ = parameters.Append((Name: "A", Value: "A")).ToDictionary(
            tuple => tuple.Name,
            tuple => tuple.Value);
    }
}

For each element where a name is missing or does not exactly match, a nullability warning returns.