WAV - A bug or just not supported?

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Highly recommend using a service to grab metadata and organize your music before throwing it into Jellyfin. Picard (or I guess MusicBrainz Picard?) is something that can help group/organize and fetch + write metadata for music. One thing about Jellyfin is that if you feed in garbage, it's gonna serve you garbage. The lack of metadata is because you haven't provided any and without any context, Jellyfin isn't going to fetch something. You've handed it a file without any indication of what the file contains and it's serving that file in the exact same manner.