I’ve noticed similar issues with Radio Paradise on the last couple of firmware versions, and I’ve reported them to Naim, so they are aware of it, but I don’t know how much of this is within their control as opposed to an RP issue.
My guess is that the album art is coming from the XPeri metadata service and not from Radio Paradise itself. Maybe @Stevesky knows if that’s the case or what is going on.
In fact I’ve rechecked and ‘weirdly’ the album art and track name matches what the RP website (browser) says is currently playing on the Mellow Mix but the music actually playing from my Nova is not even showing in the playlist (history) for the last 24 hours?