Using the 'before' query parameter when fetching clips always gives me 400 - Bad Request

The following request works without a problem:
https://api.twitch.tv/helix/clips?game_id=32399&before=eyJiIjpudWxsLCJhIjp7IkN1cnNvciI6Ik1USXcifX0&first=20

But this does not, with the same cursor and game id:

https://api.twitch.tv/helix/clips?game_id=32399&after=eyJiIjpudWxsLCJhIjp7IkN1cnNvciI6Ik1USXcifX0&first=20

Note that I am using a simple Client-ID header for authorization. Why does this happen? The error message is ‘invalid cursor’.
I am using the new twitch api

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