Hello!
Thank you for answer!
I'm not an Apple Music Member, I prefer to buy music from iTunes Store.
I had a lot of difficulties with that yesterday.. Also my PC version of iTunes doesn't connect to iTunes Store anymore after updating to 12.7. So, then I tried to delete downloads from iPhone, but when I pressed 'Remove download', It deleted only older songs (downloaded earlier from PC), other songs could be deleted with 'Delete from Library' only. So, I tried to remove it / unhide from Apple ID / redownload again.. and then Music app froze and deleted ALL music from iPhone ITSELF.. (I have 120 gigabytes of downloaded music, It erased EVERYTHING, I never had anything like that before..).
After several hours of reuploading all the music back from PC and re-downloading last purchases from Store, it is at right order now..)
I hope this will be fixed with future releases of iOS.. But now, I'm a little bit afraid of preordering music at iTunes))
I guess, the trouble happens when preorder album has some early-access tracks synced to iPhone by PC, and by the release date iPhone completes the album from iTunes store, then Music app can not manage with that and happens something like at screenshot above...
I have a huge experience of using iTunes and already bought/preordered hundreds of albums, but never seen any problems like that before 🙂