Delete items in ITunes Wish List

You'e not the only one. (You can find many others with this problem here: https://discussions.apple.com/thread/250506303)

I've experienced this problem for probably a year, stretching through many versions of iTunes, and continuing here in the Catalina-era Music app store.

If you have an iOS device try doing it on that instead, there has a problem on computer's iTunes for a number of weeks