Where are playlists stored?

I am wondering where are Spotify’s and Tidal playlists stored in my Raspberry. In the [playlist] config directory there are only the “Mopidy” playlists I have created, although Iris lists them all.
Is there a cache to rebuild/refresh for these playlists?

They are not stored anywhere. The data is downloaded from the service when requested, used during runtime and not saved to disk.

Ok.
I’m asking this because I have set several playlists in Tidal. They are immediately showing up in Iris, but they are not listed from API method core.playlists.as_list until after a couple of hours or more…

No idea. I don’t use this. I think I saw iris added some support for Tidal, maybe they are calling the Tidal API directly rather than using Mopidy, as they do for Spotify. Perhaps because Mopidy-Tidal is missing full playlist support but I’m just guessing. Post it as on the Mopidy-Tidal bug tracker if you think it’s a bug.