Is the Guardian of Neverwinter pack still available? If not, it was likely swapped-out for the Knight of Feywild package - which would explain it. It's easier and cleaner (under the hood) to simply swap-out one set of data for another set of data that to add all new data along side existing data.
The Hero of the North data remains because there is no other alternative offering at that price point. However, when there eventual is, I expect the same "issue" to occur there.
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The Hero of the North data remains because there is no other alternative offering at that price point. However, when there eventual is, I expect the same "issue" to occur there.