You've probably done it right but, regrettably, it hasn't fixed the problem. Here's the next thing I'd try:
1. Double-click 'This PC'.
2. Right-click on 'Music' and select 'Properties'.
3. Click 'Customise'.
4. Change 'Optimise this folder for' from 'Music' to 'General'.
5. Click 'Apply'.
6. Click 'OK'.
See if that makes any difference. If it doesn't, try changing 'General' back to 'Music' again.