I'd love to know the answer to this one too - such a basic requirement. I raised feedback on it months ago (FB11706965).
Also you'd think that if you tried to edit a playlist that you weren't allowed to edit at least it would throw a specific member of MusicLibrary.Error which indicated what happened. But no - you get a completely generic error. The only way you can tell what happened (as far as I can see on 16.1) is by looking for a specific string in the error text (reported as FB11740727).
Topic:
Media Technologies
SubTopic:
General
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