Qobuz playlists not showing is a known issue and a fix is under way. However, only the Qobuz playlists in Home > Qobuz should be missing.
Other Qobuz content should work normally, if you experience this known issue. Older playlists are normally also visible in Roon sidebar > Playlists > Qobuz. See this pinned thread:
If you can’t access any Qobuz content, then you are experiencing a different issue. It would be helpful if you could describe in more detail. It’s a bit unclear what you actually meant here: