@anon90297517 See this post below, and some of the other posts earlier in this thread, that describe it issue. It mostly manifests itself when playing Roon Radio or a Tidal/Qobuz sources playlist. Those situations are playing Non-Library references to the track, even if the track actually exists in your library so adding it to a playlist will add the non-library reference.
Conversely, a playlist can contain both library references and a non-library references to the exact same track at the same time. The Library reference will be Taggable and show play counts etc, the Non-Library reference will not.