If a song that was recently played and is already part of the playlist is played again (this, in and of itself, is an issue... but is a backend issue, we probably shouldn't be playing the same song again within a few songs of when it was last played) it confuses the Playlist as well as sometimes (need to track down/re-produce) the album artwork. E.g. the spotify currently playing is correct, but the Now Playing section does not appear to be updated and the Playlist shows the wrong instance of the song, or sometimes the wrong song altogether (also need to track down and re-produce this) as playing (e.g. the duplicate is appended to the playlist as expected, but the playlist shows the speaker/playing icon next to the first instance of the playlist.)
Since the playlist is a core spotify component, this may need to wait for an API update...