Factorio Forums

As you can see from the debug view, game is valuing chunks for expansion that they can't get to, as high potential 1.0.
We made a mistake generating such a ribbon world in the first place, but the aliens are giving no challenge at all even with Rampant mod. They can't send attack waves, so my only hope was that they would expand closer to us. Doesn't seem likely that they will though.

Also player base (or the center of pollution) in the picture is towards east, so maybe that direction should be valued higher.

Accessibility is not evaluated for this overlay.
You will only be attacked if the enemy is within your pollution cloud, if you are sure that they are post the save please.

Rampant acts differently, it will periodically attempt to send attack waves. Our pollution is nowhere near them. Why none of them get to us i don't know, but it's propably due to his script. I've made sure there's enough land connections, and i keep making more with landfills.

But if you say accessibility will be checked later correctly then this can be ruled out "not a bug".