A word of warning for anyone using Sonarr installed from the TrueNAS app catalogue: the new version pushed out today (5.0.0.2569) is a beta release and very rough around the edges. I’d recommend not updating.
The latest stable release is 4.0.20.3014 (which I’m now going to roll back to).
Also, I really must stop using the app catalogue version and migrate my set up to a custom app.