You are right. It worked in my iphone but not in my wife's. Same as you, some coivers were not fixed. Apologies.
I run the process deleting and reinstalling everything, not just in the iphone but in the compuer. It worked for my wife phone that had an almost unusable library.
It is a lengthy process and you need to be confortyable with manipulating windows folders. See the updated process below. Basically you delete and reinstall everything.
There is not excuse for apple not fixing a problem that have years. But the solution below is the only one that I have found that worked (at least for me).
Process Summary
1. Delete your music application and data from your iPhone
2. Reinstall your iPhone music application.
3. Delete your music application and data from your Desktop Computer
4. Reinstall your Desktop Music Application
5. Recreate music data in your Desktop Computer
6. Recreate music data in your iPhone
Process Details
1. Delete your music application and data from your iPhone
In your iPhone, navigate to
Settings > General > iPhone Storage > Music > Delete App
That will delete all your iPhone songs and the Apple Music Application
2. Reinstall the iPhone Music Application
In your iPhone execute the App Store and reinstall the Apple Music App.
3. Delete your music application and data from your Desktop Computer
In your desktop
· Backup your desktop music folders
Copy the iTunes Folder located in
This PC > Music > iTunes
To
This PC > Music
At the end you will have two sets of iTunes folders, the original and the backup.
Original ---> This PC > Music > iTunes
Backup ---> This PC > Music > iTunes – Copy
· Delete your Original desktop music folder
Delete the folder
Original --------> This PC > Music > iTunes
· Delete the Desktop iTunes application
From Windows, execute the Control Panel Application and Uninstall iTunes.
4. Reinstall your Desktop Music Application
From Internet, reinstall the last version of the iTunes Application
At the end you will have a new empty Music Library at:
This PC > Music > iTunes > iTunes Media > iTunes Library
5. Recreate music data in your Desktop Computer
This process will store your backup music in the Library created above.
In the Desktop:
· Copy the backup music. Place the cursor in the file below and enter <Ctrl> C to copy the following folder to the
clipboard
This PC > Music > iTunes > iTunes Media > Music
. Paste the copied data in the following folder. Navigate to a
This PC > Music > iTunes > iTunes Media > Automatically Add to iTunes.
and enter <Ctrl> V
This process will include the pasted music in the new iTunes library. The process ends when the
Automatically Add to iTunes folder does not have any music files.
· Execute iTunes as follow:
Press the <Shift Key) and click on the iTunes icon.
. iTunes will popup a window for the user to select or create a music library. Click on the Chose Library
button.
· Enter o select the name of the library created above:
iTunes Library
and press the Open Button
. iTunes will show your new desktop library. All Album covers should be OK.
6. Recreate music data in your iPhone
In the Desktop
. Connect you iPhone to the computer and run the synchronize process.
This process will copy all your music to the iPhone
At the end of the process your covers should also be OK in the iPhone.