When I search for Vladimir Horowitz and select it I get a page with him as artist and composer and when I click on Discographie I get 179 hits for main albums (with Tidal) and when I click on compositions I get 10 pieces not albums.
Searching for “Dinu Lipatti” shows a Composer with that Name but no Artist with that name. When going to the Composer “Dinu Lipatti” Roon does not show me the albums I have locally in my library.
So I can display this album “Klavier Kaiser: 11” and when I click on “Dinu Lipatti” right below the Album name, there is no album from my library shown.
Works for Wilhelm Kempff, maybe an issue with Actual Composer/performers like Bernstein You will lose one or the other, in the Kempff example he transcribed a few bits of Bach , not too worrying