10.3 crashes when reflecting embedded methods

internal static class NinetyNineBottlesOfBeer
{
    private static void Main()
    {
        foreach (var line in GetSongText())
            System.Console.WriteLine(line);

        System.Console.ReadLine();

        System.Collections.Generic.IEnumerable<string> GetSongText()
        {
            var numberOfBottles = 99;

            do
            {
                var oldNumberText = GetNumberText(numberOfBottles);

                if (numberOfBottles > 1)
                {
                    yield return $"{oldNumberText} bottles of beer on the wall,";
                    yield return $"{oldNumberText} bottles of beer.";
                    yield return "Take one down, pass it around,";

                    numberOfBottles--;

                    var newNumberText = GetNumberText(numberOfBottles);

                    if (numberOfBottles > 1)
                        yield return $"{newNumberText} bottles of beer on the wall.";
                    else
                        yield return $"{newNumberText} last bottle of beer on the wall.";
                }
                else
                {
                    yield return $"{oldNumberText} last bottle of beer on the wall,";
                    yield return $"{oldNumberText} last bottle of beer.";
                    yield return "Take it down, pass it around,";
                    yield return "No more bottles of beer on the wall.";

                    numberOfBottles--;
                }

                yield return string.Empty;
            } while (numberOfBottles > 0);

            string GetNumberText(int number)
            {
                switch (number / 10)
                {
                    case 9:
                        return GetComboNumberText("Ninety", GetLastDigitText(number - 90));
                    case 8:
                        return GetComboNumberText("Eighty", GetLastDigitText(number - 80));
                    case 7:
                        return GetComboNumberText("Seventy", GetLastDigitText(number - 70));
                    case 6:
                        return GetComboNumberText("Sixty", GetLastDigitText(number - 60));
                    case 5:
                        return GetComboNumberText("Fifty", GetLastDigitText(number - 50));
                    case 4:
                        return GetComboNumberText("Fourty", GetLastDigitText(number - 40));
                    case 3:
                        return GetComboNumberText("Thirty", GetLastDigitText(number - 30));
                    case 2:
                        return GetComboNumberText("Twenty", GetLastDigitText(number - 20));
                    case 1:
                        return GetTeenNumberText(number);
                    case 0:
                        return GetLastDigitText(number);
                    default:
                        throw new System.NotSupportedException();
                }

                string GetComboNumberText(string tens, string ones) => ones != null ? $"{tens}-{ones}" : tens;

                string GetTeenNumberText(int teenNumber)
                {
                    switch (teenNumber)
                    {
                        case 19:
                            return "Nineteen";
                        case 18:
                            return "Eighteen";
                        case 17:
                            return "Seventeen";
                        case 16:
                            return "Sixteen";
                        case 15:
                            return "Fifteen";
                        case 14:
                            return "Fourteen";
                        case 13:
                            return "Thirteen";
                        case 12:
                            return "Twelve";
                        case 11:
                            return "Eleven";
                        case 10:
                            return "Ten";
                        default:
                            throw new System.NotSupportedException();
                    }
                }

                string GetLastDigitText(int lastDigit)
                {
                    switch (lastDigit)
                    {
                        case 9:
                            return "Nine";
                        case 8:
                            return "Eight";
                        case 7:
                            return "Seven";
                        case 6:
                            return "Six";
                        case 5:
                            return "Five";
                        case 4:
                            return "Four";
                        case 3:
                            return "Three";
                        case 2:
                            return "Two";
                        case 1:
                            return "One";
                        case 0:
                            return null;
                        default:
                            throw new System.NotSupportedException();
                    }
                }
            }
        }
    }
}