I'd like to share something I came across recently, which you might find helpful.
In the Tidal connect app, the library albums that are no longer available (but still remain in your library as favorites) now appear as "semi-opaque", so you can easily spot them.
You can delete them (un-favorite them) but then you can also go ahead and check if the album is still available, albeit at a different form.
This can happen for a multitude of reasons but amongst the most common ones are that either the album stopped being available altogether (copyright infrigment, etc.) or it has changed version (better version with newer remastering and/or higher resolution, etc.).
Sometimes it may be that Tidal has re-clasified it but under the wrong, albeit simirarly named, artist. These "mistakes" are more often that not quite blatant, but I digress...
Now, in the case of larger libraries (like mine...), going through all your albums to spot the unavailable ones can be tricky because the app throws you back at the beginning every once in a while and this has nothing to do with processing power or RAM. The problem lies with the app entirely but there is a workaround: if you do a search by common letters, while you're in your library, the search result will be rock solid and then you can wade through that until the end without the app misbehaving.
For example if you search for the letter "a", then "e", etc. you're bound to find everything with a little patience.
My Tidal library appeared to be 300 albums bigger than my Innuos one and after going through the above mentioned process, they are now the same...
...well, almost the same, actually. Now my Innuos library seems to have 6 more albums. than my Tidal one.. Why? Because Innuos also counts more than one favorited individual tracks from the same album in Tidal as tracks belonging to an album... hence the discrepancy.
What would be helpful though, irespective of having a large library or not, would be for those 'semi-oaque" albums to be able to be grouped somehow, so one wouldn't have to go through the search merry go round.