Hello! After updating Spotify (0.8.8....) some weeks ago, some of the playlist images for my playlists with local files have disappeared, not all of them. When playing a local file the artwork from the tag is displayed correctly in the bottom-left corner of Spotify, but not for the playlist image. I did not have this issue before this recent update.
I've heard it might be because of different resolutions, but after checking the resolutions for artwork that does work and doesn't work, I can't find any pattern.