First of all I've just played next map with this awful regions bug. Sadly "Last Played" does not work for me lastly (showing way older maps, not those that I've recently played) so I don't have exact map name. Anyway, while playing, one player stated that he's author of this map, and next turn he used bugged region to attack other player that totally did not expect such situation. He did also tell that he knows how to cause this bug to appear, but denies to report it even directly to you Lopdo 'cause that's how he "gets exp". Screen showing bugged region and piece of chat follows:

I've checked first 100 pages of new maps, but I did not find this one. Probably that's quite old map that was rarely used so it was missed while fixing spree. I suppose that bug causing it has been already fixed, but if not this player might have some interesting data. Also fact of using this bug as primary source of exp/shards gain should be punished somehow.