There's a breaking change in this: Spotify can no longer be used to fetch images (or anything - did it do anything else?)

From the commit message:

Remove the built-in Spotify adapter from Navidrome due to Spotify's change in API usage policy. Since March 9, 2026, all Spotify Development Mode apps require the app owner to have an active Spotify Premium subscription, making it impractical to maintain as a built-in integration.

Deezer is a good built-in replacement for artist images, and it works out-of-box, no need for extra configuration. Users can also use artist-nfo-metadata as the first agent option to override any incorrect images. For those who want Apple Music integration, the new Apple Music plugin is available as a drop-in replacement using the plugin system.

Pretty bad release it appears, album art melts CPU and causes 500 errors, rolled back.