Greyed out tracks on Rush 50 on Apple Music

So I’m trying to download the Rush ‘50’ compilation on Apple Music to listen in my car. I downloaded the tracks on release day and all 50 tracks were available. However 15 of the tracks are now greyed out, tracks 9-13 on disc 3 and tracks 1-10 on disc 4, all are marked as ‘unavailable in your country’ I’m in the UK and all of these tracks are available on other Rush albums in The UK so why are they greyed out on this compilation?