Get Followed Artists not returning previous page

[ou818]

I made a web API request to get all the artists that I'm currently following.

(Web API Reference | Spotify for Developers)

curl --request GET \ --url 'https://api.spotify.com/v1/me/following?type=artist&after={after}&limit=20' \ --header 'Authorization: Bearer ${TOKEN}'

In the response sample there's meant to be a 'before' cursor that takes you back to the previous results, but this cursor isn't showing up. Is this a bug or am I missing something?