Web Playback continually cycles through same two songs when calling next on a playlist uri

[Nickprovs]

Issue found on -1/06/20.

Scope(s):

const scope = "streaming user-read-private user-read-email user-read-playback-state user-top-read user-library-read user-modify-playback-state user-library-modify";

Steps to reproduce:

1. Embed spotify web player sdk within web page
2. Transfer playback to this spotify web player
3. Use the web api player/play endpoint to start playing a playlist with more than two songs with a given uri.
4. The music starts playing on the web page.
5. Send a few next (skip to next) calls to the web api.
6. Notice that you'll be playing the same two songs over and over when hitting next.

The key takeaway here is that this only happens when the device is the web playback sdk. If you make these same calls but the playback device is something else, it works fine.

Expected behaviour:

Playback SDK should continally skip to different songs within the playlist when calling "next".

Actual behaviour:

Playback SDK keeps cycling the same two songs within the playlist.