Преобразование кода из PasswordDerivedBytes в Rfc2898DerivedBytes, unicode

Я пытаюсь заменить PasswordDerivedBytes на Rfc2898DerivedBytes, но у меня проблема с последним при получении результата в кодировке Unicode.

Возьмем, к примеру, этот код:

    [TestMethod]
    public void DerivedBytesTest()
    {
        string encrypted = "y4Ijqo9Ga/mHlFbLHDdDUkYZlyu7CHF4PVXGLnb8by7FAVtCgPLhFSiA9Et6hDac";
        string key = "{00B3403A-3C29-4f26-A9CC-14C411EA8547}";
        string salt = "gT5M07XB9hHl3l1s";
        string expected = "4552065703414505";
        string decrypted;

        decrypted = Decrypt(encrypted, key, salt, true);
        Assert.IsTrue(decrypted == expected); // Works

        decrypted = Decrypt(encrypted, key, salt, false);
        Assert.IsTrue(decrypted == expected); // Doesn't work, get wrong unicode characters in 24 character string
    }

    private string Decrypt(string encrypted, string key, string salt, bool legacy = false)
    {
        UnicodeEncoding encoding = new UnicodeEncoding();

        byte[] encryptedDataBytes = Convert.FromBase64String(encrypted);
        byte[] saltBytes = encoding.GetBytes(salt);

        RijndaelManaged encryption = new RijndaelManaged();
        DeriveBytes secretKey;

        if (legacy)
        {
            secretKey = new PasswordDeriveBytes(key, saltBytes) {IterationCount = 100};
            encryption.Padding = PaddingMode.PKCS7;
        }
        else
        {
            secretKey = new Rfc2898DeriveBytes(key, saltBytes, 100);
            encryption.Padding = PaddingMode.Zeros; // This is the only one that doesn't throw the "Padding is invalid and cannot be removed" exception, but gives me a non-ASCII result
        }

        ICryptoTransform decryptor = encryption.CreateDecryptor(secretKey.GetBytes(32), secretKey.GetBytes(16));

        string decryptedText = "";

        using (MemoryStream memoryStream = new MemoryStream(encryptedDataBytes))
        {
            using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
            {
                byte[] bytes = new byte[encryptedDataBytes.Length];
                int decryptedCount = cryptoStream.Read(bytes, 0, bytes.Length);
                decryptedText = encoding.GetString(bytes, 0, decryptedCount);

                if (!legacy)
                {
                    // Something more to do with result?
                }
            }
        }
        return decryptedText;
    }

Интересно, может ли кто-нибудь посоветовать, где я ошибаюсь?