Why can't I add certain songs to my Apple Music library?

i have come across multiple songs where I can play the song fine, but I can’t add it to my library or playlists, and I can’t download it either. I have tried adding the whole album Hit Me Hard and Soft by Billie Eilish, but the songs “Chihiro” “The Greatest” and “Blue” do not get added. When I add those songs to a playlist, the songs are grayed out and it says “This item is not currently available in your country.” This is very frustrating and I hope it’s just a bug. I am able to play the songs when I go to the artist page, but I cannot add them to my library. Please advise, thanks.