I have noticed periods of time where Tidal is not refreshing. I think this is a Tidal interface issue not Roon, but think it would be helpful to start logging them here.
I have a new playlist that i favorited in Tidal. It shows in Tidal app but not in Roon. I have gone to TIDAL in Roon and Settings/Services and the Tidal update never finishes.
Additionally, the new playlist does not show up in Soundiz.
I had a similar problem yesterday, but could not play any Tidal tacks or update it. I logged out of Tidal from within Roon and then back in again and this fixed it. Have you tried this?