Hi, so I've been having this issue for quite a while now, maybe more than a year.
I used my Facebook account to sign up Spotify and I have the [Facebook Data] ON under my account privacy setting.
On my Pixel 3 XL, Spotify displays my name correctly on Setting, Account Info, Playlist overview, but NOT on the song screen (see the screenshot 02.png).
I do not understand why or how. I understand that Spotify retrieves data from my data from Facebook, but if there was an issue, then Spotify wouldn't display my name correctly anywhere. So Facebook connection is definitely not the issue here.