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Fixed and shipped.
The links were never the problem — I decoded the three clickable shapes out of the shipped bundle and they are 48-74% opaque, span their full rects, and land squarely on the painted regions, so the click registered and the tab changed.
What failed was the frame after. World-map art is fetched per CHUNK (~2.5MB), and a tab's children are not necessarily in the parent's chunk. When they are not, the re-render lands on a tab whose painting is not loaded yet, so you get the parchment frame and its markers with nothing behind them — which reads exactly as "the click did nothing". Dawnveil is chunk 5 and all three of its regions are in chunk 6, so it failed every single time, which is why this is the one that got reported.
It was not unique to Dawnveil: the root overview has 13 of its 15 continents in other chunks. A region's painting is now fetched BEFORE the click rather than after it, for every drill-down in the game.
LIVE on the published build.