Iphone Apple Music issue? (Item not available)

I have a playlist of old 70s and 80s songs that I dont add to my library because I like them only in the playlist. For some reason, half of them are now blanked out grey and the Item not available thing pops up.

Its weird because when I hold my finger on it to bring up the menu, I click on the album its from and I go to it and it starts playing. I search for the exact song in apple music and it plays for me. Why is it Unavailable in my playlist that Ive had for a while?

Ive reset my phone but nothing changed