Song not available in this region

Hi

I've had random songs in my playlists showing as "not available in this region", but they clearly are (Cure, Pink Floyd, Beatles, etc - in the UK!).

I have resync'd, deleted all my music and recovered from backup.

I have no local music, this is all Apple Music.

I think I know what's wrong though - if I pick a specific song in one of my playlists, "Accuracy" by The Cure, it shows as unavailable, as is most of the album:

but you can see the album is classed as "Rock - 1980". If I then go and search for the album, I get this:

Which shows as "Alternative - 1979".

I'm wondering if in reclassifying albums as, say lossless, they've deleted the original links?

Deleting and re-adding each song in a playlist of thousands is going to take hours, many many hours, and I have no confidence that Apple won't reclassify albums again in future? What happens if an album is moved to hi-res, so I lose the link again?

Any ideas - I'm tempted to export the playlists using a third party tool, delete all the playlists, and import them and hope the lookups work?

Shaun