Web Playback SDK reports a different album uri to the one requested to play via api

[tomjwatson]

I am creating a Spotify web app using the Web Playback SDK and the Spotify API.

When I make a request to play an album via the API with `context_uri: <uri of album>`, I sometimes then have my web player report a different album uri as being played when reading the player's state either via the `player_state_changed` event or `getCurrentState()`.

For example, when playing the album `4KnFXX4nObGw6rq9aQmSyf`, the player reports that the album being played is `2y2QZ4uDpzoZHgH2il5Ktu`.

These both seem to open on Spotify to the same album:

https://open.spotify.com/album/4KnFXX4nObGw6rq9aQmSyf 

https://open.spotify.com/album/2y2QZ4uDpzoZHgH2il5Ktu 

The first link correctly shows the album as favourited on my account, and the second does not.

This only happens on a minority of albums. The vast majority work as expected.

What is going on here? Is this a bug on Spotify's side?

[tomjaimz]

This is usually due to the Spotify feature known as track relinking - https://developer.spotify.com/documentation/general/guides/track-relinking-guide/