It's the COMPOSER, Stupid!

You’ll see our genres when browsing TIDAL albums outside of your library and nothing (except what you’ve groomed manually) when browsing TIDAL albums that have been added to your library.

It’s a pretty extreme setting, with tradeoffs. The more moderate approach is to enable both and map/edit the hierarchy to make things reasonable.

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Personally, I turned off Tidal and correct the metadata on my albums (to be what I want) when I play them. Kind of a pain but, hey, what else can you do?