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That's the thing, they don't even reach the trigger; I'm starting to think that the region acts as an obstacle for them... although there are absolutely no region-based restrictions (the larger I make the region, the further away from the destination the heroes stop :))
I don't know if it's related, but I placed a Mask in one location on the map to prevent anyone from entering. However, as soon as an object (art) is teleported there using scripts, the mask stops working.