Ah, I had changed it because I thought Zara Larsson was just the featured artist, not (also) part of the title. MusicBrainz is not really sure which one it is either . There are other remixes (+ Groove Armada, + Kylie Minogue, + Bladee), and also there MusicBrainz is not consistent. The cover doesn't help here either (no text). I find references like
“Stateside” by PinkPantheress and Zara Larsson has reached 200 MILLION streams on Spotify.
So I guess, after all, the song is called Stateside. She sang it on her own and there are four different remix versions, each with a featured artist. I'm fine with leaving it the way it is now, but I'd lean towards removing "Zara Larsson" from the title, especially because she's already listed as a featured artists and it doesn't add more information.
Just to clarify :)The name of the song is Stateside + Zara Larsson and the artist is PinkPantheress featuring Zara Larsson. How to denote the latter is perhaps a bit arbitrary though. For instance, Spotify says PinkPantheress, Zara Larsson and Tidal PinkPantheress & Zara Larsson.