[C#, Json.NET] デシリアライズで予期しない文字が発見されエラー。

発生している問題

Newtonsoft.JsonConvert.DeserializeObjectでYouTubeDataAPIv3から返されるJsonをデシリアライズしようとすると、予期しない文字が発見されデシリアライズできない。

エラーメッセージ

Newtonsoft.Json.JsonReaderException: 'After parsing a value an unexpected character was encountered: O. Path 'items[0].snippet.tags[7]', line 55, position 6.'

該当のソースコード

MainWindow.xaml.cs (一部省略)

c#
public static string GetVideoTitle()
{
    string videoId = "IGInsosP0Ac"
    string api = $"https://www.googleapis.com/youtube/v3/videos?part=snippet&id={videoId}&key={googleApiKey}";
    var json = new WebClient().DownloadString(api);
    var ytd = JsonConvert.DeserializeObject<YouTubeDataAPIv3SnippetData>(json);
    string result = ytd.items[0].snippet.title;
    return result;
}

YouTubeDataAPIv3SnippetData.cs (一部省略)

c#
class YouTubeDataAPIv3SnippetData
{
    public class PageInfo
    {
        public int totalResults { get; set; }
        public int resultsPerPage { get; set; }
    }

    public class Default
    {
        public string url { get; set; }
        public int width { get; set; }
        public int height { get; set; }
    }

    public class Medium
    {
        public string url { get; set; }
        public int width { get; set; }
        public int height { get; set; }
    }

    public class High
    {
        public string url { get; set; }
        public int width { get; set; }
        public int height { get; set; }
    }

    public class Standard
    {
        public string url { get; set; }
        public int width { get; set; }
        public int height { get; set; }
    }

    public class Maxres
    {
        public string url { get; set; }
        public int width { get; set; }
        public int height { get; set; }
    }

    public class Thumbnails
    {
        public Default @default { get; set; }
        public Medium medium { get; set; }
        public High high { get; set; }
        public Standard standard { get; set; }
        public Maxres maxres { get; set; }
    }

    public class Localized
    {
        public string title { get; set; }
        public string description { get; set; }
    }

    public class Snippet
    {
        public DateTime publishedAt { get; set; }
        public string channelId { get; set; }
        public string title { get; set; }
        public string description { get; set; }
        public Thumbnails thumbnails { get; set; }
        public string channelTitle { get; set; }
        public List<string> tags { get; set; }
        public string categoryId { get; set; }
        public string liveBroadcastContent { get; set; }
        public Localized localized { get; set; }
    }

    public class Item
    {
        public string kind { get; set; }
        public string etag { get; set; }
        public string id { get; set; }
        public Snippet snippet { get; set; }
    }

    public string kind { get; set; }
    public string etag { get; set; }
    public PageInfo pageInfo { get; set; }
    public List<Item> items { get; set; }
}

YouTubeDataAPIv3から返されるJson

json
{
 "kind": "youtube#videoListResponse",
 "etag": "\"Bdx4f4ps3xCOOo1WZ91nTLkRZ_c/jwhb_FJuvFIgM29Nxg3M12Z67eM\"",
 "pageInfo": {
  "totalResults": 1,
  "resultsPerPage": 1
 },
 "items": [
  {
   "kind": "youtube#video",
   "etag": "\"Bdx4f4ps3xCOOo1WZ91nTLkRZ_c/CiszAW_8Yo76GYB0bpHxx6-vvf0\"",
   "id": "IGInsosP0Ac",
   "snippet": {
    "publishedAt": "2018-11-23T04:55:15.000Z",
    "channelId": "UCzycs8MqvIY4nXWwS-v4J9g",
    "title": "ONE OK ROCK: Stand Out Fit In [OFFICIAL VIDEO]",
    "description": "ONE OK ROCK's official video for 'Stand Out Fit In’. \nDirected By Peter Huang\n\nSubtitles by Taka and Yasuko Ishida\n\nPre-order Eye Of The Storm today: https://amuse-inc.lnk.to/ONEOKROCK\n\nFind ONE OK ROCK on… \nSite: http://www.oneokrock.com/ \nFacebook: http://smarturl.it/OORfacebook \nTwitter: http://smarturl.it/OORtwitter \nInstagram: http://smarturl.it/OORinstagram \nYouTube: http://smarturl.it/OORyoutube \nSpotify: http://smarturl.it/OORspotify",
    "thumbnails": {
     "default": {
      "url": "https://i.ytimg.com/vi/IGInsosP0Ac/default.jpg",
      "width": 120,
      "height": 90
     },
     "medium": {
      "url": "https://i.ytimg.com/vi/IGInsosP0Ac/mqdefault.jpg",
      "width": 320,
      "height": 180
     },
     "high": {
      "url": "https://i.ytimg.com/vi/IGInsosP0Ac/hqdefault.jpg",
      "width": 480,
      "height": 360
     },
     "standard": {
      "url": "https://i.ytimg.com/vi/IGInsosP0Ac/sddefault.jpg",
      "width": 640,
      "height": 480
     },
     "maxres": {
      "url": "https://i.ytimg.com/vi/IGInsosP0Ac/maxresdefault.jpg",
      "width": 1280,
      "height": 720
     }
    },
    "channelTitle": "ONE OK ROCK",
    "tags": [
     "ONE OK ROCK",
     "ワンオク",
     "ワンオクロック",
     "Taka",
     "Toru",
     "Ryota",
     "Tomoya",
     "バンド",
     "OOR",
     "ロック"
    ],
    "categoryId": "10",
    "liveBroadcastContent": "none",
    "localized": {
     "title": "ONE OK ROCK: Stand Out Fit In [OFFICIAL VIDEO]",
     "description": "ONE OK ROCK's official video for 'Stand Out Fit In’. \nDirected By Peter Huang\n\nSubtitles by Taka and Yasuko Ishida\n\nPre-order Eye Of The Storm today: https://amuse-inc.lnk.to/ONEOKROCK\n\nFind ONE OK ROCK on… \nSite: http://www.oneokrock.com/ \nFacebook: http://smarturl.it/OORfacebook \nTwitter: http://smarturl.it/OORtwitter \nInstagram: http://smarturl.it/OORinstagram \nYouTube: http://smarturl.it/OORyoutube \nSpotify: http://smarturl.it/OORspotify"
    }
   }
  }
 ]
}