这是当前Apple Music API中的错误.如您所述，不在用户库中而是从AM流式传输的歌曲不会返回专辑插图.

This is a bug in the current API for Apple Music. As you mentioned, songs that are not in the user's library but are instead streamed from AM will not return album artwork.

您应该在bugreport.apple.com上进行功能增强(您也可以在6个月前将其欺骗25413082).

You should file a feature enhancement at bugreport.apple.com (you can also dupe mine from 6 months ago 25413082 ).

与此同时，***的选择是使用iTunes api来检索专辑插图，但是不幸的是，这并没有100％的时间返回正确的结果...

In the meantime your best bet would be to use the iTunes api to retrieve the album artwork, unfortunately this doesn't return the correct results 100% of the time...