Many of the 'Holiday Giveaway' items from last year no longer exist on the store, causing the worlds made with the 'Maps' to be 'locked' with a padlock icon. Upon attempting to access the world, the game notifies you that you currently do not own the maps associated with the world, and does not let you purchase the worlds or unlock the world in any way to continue play.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32086.
Just a quick note - don't worry that this ticket says resolved - we are still working on fixing this issue, but it's easier to keep track of the issue in a single ticket, so please refer to MCPE-32086 for the latest details.
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Hello! We are working on getting a fix out for this ASAP. Thank you for your patience!