That's just an extract mistake, they have 2 folders WorldMap and Worldmap ... which is actually all just 1 folder in the actual wow data and contains every map for every zone no matter what classification they are.
The 3 zones are located in WorldMapArea tables, and have entries in the WorldMapOverlay tables so they are real zones not instances
However I do believe it may be right they've put everything into one minimap tile table because they are so small.
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