You are correct in that guess. This is a known bug and since tutorial gear isn't that common outside of alts and new players, I decided that this wasn't a particularly important bug to work around. As a result, they aren't even seen to be equipment by my add-on.
There is an API function that takes an item (bagId, slotIndex) and a tradeskill type and returns whether or not that item may be deconstructed in that tradeskill. That is the way that I figure out what tradeskill a given item belongs to and, unfortunately, I do not know of a better way than that.
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