Track with thumbnails not displaying thumbnails

[fdobre]

Using a track with thumbnails displays text instead of thumbnail:

OS: both Android and iOS

"react-native-jw-media-player": "0.2.46",

tracks: [{
          file: 'https://cdn.jwplayer.com/strips/EMSoi97G-120.vtt',
          label: 'thumbnails',
          default: true,
          kind: 'thumbnails'
        }]