I unsubscribed from the Marketplace Pass, and when I tried to access one of my worlds containing these premium packs, I received an error message stating that I needed to delete the packs to be able to play in that world. But even after deleting them, the message kept appearing and blocking my access to the worlds.
MCPE-233732
Unplayable world due to an error message stating that i don't own the Marketplace pass packs (MAJOR BUG)
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Did you only delete the packs from Settings > Storage, or did you also deactivate them in the world settings? After a pack is deleted from storage, it remains active in any existing worlds that had the pack applied to and must be manually deactivated.
Click the Edit button for the world and check both the Resource Packs and Behavior Packs tabs to verify.