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The thing is that I'm pretty sure, like almost a hundred percent certain, that I saw the album art showing up in the notification center, when I began using the "now playing"-widget. But then it suddenly disappeared, and got replaced by the spotify logo itself to indicate that it was the current program that was using the media keys/widget. So that's why I find this situation so weird. Would also apprechiate a fix/update for this, spotify.
I can relate. I believe it was about a year ago, when I began using the "Now Playing"-widget in the notification center on my MacBook Air (Early 2015). The very first song I played, viewed the artwork for the song. But when I skipped track, it got replaced with the Spotify logo. Just like you. It never worked again, and I find it cheap looking. So I'd really prefer if there could be an update to fix this small issue.