Not strange at all actually.
If you didn’t know, when using Mosaic, the music catalogs you browse comes from airable servers, not the streaming Services. When you select a particular album/track, only then does dCS pull streams directly from Qobuz (or Tidal) Servers.
And there’s always a slight delta between airable’s catalogs and the native streaming Sources. In the particular case you raised, airable is pointing Mosaic to a track that Qobuz does not want to stream natively (MQA is being systematically removed from everywhere).