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Apologies for the delay replying -

The export to png works for this town in Chrome and Edge - it doesn't work consistently in Firefox.

I've put an image of the console output when it fails on firefox - hopefully this is useful for you!

I've found exactly the same problem - creating city/town maps for a small island, and downloaded the first 2 no problem, but the 3rd has this exact issue - clicking "export as png" either in the menu or via right click just shifts the map to the left on the screen and doesn't attempt to save it. However, saving one after this had no trouble.

The link to the map that I'm having trouble with is below. I used Azgaar's map generator which loads seeds for each city.
https://watabou.github.io/city-generator/?size=24&seed=1310050910026&name=Durnum...