[0.18.12] Enemies pathfinding cannot navigate to the base

[Barbossahector]

1. I am currently playing on a modified rail-death world. I shelled alien nests with artillery when I noticed that counterattacks were not coming.

http://drive.google.com/open?id=1WA7JNU ... 2g8Bsk6gEq

2. I built a small outpost in a specific place on the sea shore and in the forest that provides me more defense against attacks. I manually target and fired at the position visible in the graphic above, and I noticed unusually large groups of opponents that can't navigate to my base. I reload the game, load save hoping that attack will came. Then i fired again at them and group just get bigger.

http://drive.google.com/open?id=1wKMqA9 ... StCQUBxfnK

3. I would like the attack after artillery fire find a way to my outpost. For 40 hours of biter killing this is first problem with their pathfinding.

I think the problem is caused by unusual outpost placement and pathfinding just can't handle it. To reproduce my bug, use save 1 and manually fire at base marked with circle in graphics. In my 3 attempts to reproduce the bug, 3 times it appeared.

Save 2 contains large group of enemies that can't find a path to my outpost.

https://drive.google.com/file/d/1Ha7HtC ... IodFX/view

I was waiting for those attacks from 3 to 5 minutes and they have always been waiting in biters bases. This problem does not crash the game, but it is troublesome in clearing the world from biters ( I must walk to group, and drop nuclear weapons on them )

Links for save files:
https://drive.google.com/open?id=1WgIgq ... oPaszvLBub
https://drive.google.com/open?id=115UyB ... s6C4kcZURk

Edit: It seems that bug may be related with post:
viewtopic.php?f=7&t=80392

[Klonan]

When I shoot the artillery, they come and attack me without issue:

[Barbossahector]

I see. I think it's quite unusual that the problem only existed with one group of bases in the north, marked with circle. When I attacked other spawners from the same outpost, the attacks came normally.