Thank you for confirming, @vaughangr.
I moved your post over to this existing thread: What happens to my content if I downgrade from Premium
When you downgrade from Pandora Premium to Plus or ad-supported Pandora, you will not be able to access your on-demand music collection or custom playlists. However, your collection and playback history will be stored in our servers for when you return to Premium.
Check out the accepted solution for more information.
I hope this helps!
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