Thanks for that info and choosing the Apple Support Communities. Based on what you stated, it seems you are having issues with music in a playlist missing songs in the Music app. To help resolve this issue, please follow these steps from these relevant resources on your situation, along with any other relevant steps contained in these articles.
If some of your songs are missing or the song names appear in gray text
If songs that you bought are missing or the song names appear in gray text, they might use digital rights management (DRM). You need to authorize your computer before you can play these songs.
After you authorize, choose File > Library > Update iCloud Music Library from the menu bar at the top of your computer screen or the top of the iTunes window.
If you synced the songs that appear with gray text to your iOS device from a Mac or PC, turn on iCloud Music Library on that computer and your library should update.
If you're missing or can't play music
- Make sure that you're signed in with the Apple ID and password that you use with your Apple Music membership and to make purchases from the iTunes Store.
- Check to see if your Apple Music membership is active.
- Check to see if the purchases are hidden, then unhide them.
- Learn what it means if songs appear in gray text.
- Learn what to do if you see an exclamation mark next to content in iTunes.
- Learn what to do if you don’t see all of your songs, albums, playlists, or other imported content after you update iTunes on your computer.
Access your music collection on all of your devices with Apple Music
Get help with iCloud Music Library
Cheers!