[0.18.36] Biters can create nests through cliffs

[Omnifarious]

I recently had a game in which I was using cliffs as a barrier. I had properly walled up all the tiny chokepoints that would enable to biters to escape past the cliff wall. They did anyway.

The way they did this was by nesting right next to cliffs. When a new spawner was created from this, it was created on the other side of the cliff. Hilarity and much base munching ensued forthwith.

I suspect this is unexpected behavior. Whether or not you want to fix it... well, I think people expect cliffs to be unpassable barriers and that most people would find this very surprising. Though, perhaps some justification based on tunnelling in their larval forms or something. I mean, the worms are stuck in giant holes. Still, this seems wrong.

[Loewchen]

Post a save showing this actually happening please.

[Omnifarious]

Post a save showing this actually happening please.

I can post a save where it happened in the past and have myself standing where it happened. But I cleared out the nest before I realized I'd seen a bug, and so I don't have a save showing the immediate aftermath.

[Loewchen]

I can post a save where it happened in the past and have myself standing where it happened.

No that does not help showing what is actually happening.
I'll put this in pending until someone can show how to reproduce this.

[Omnifarious]

No that does not help showing what is actually happening.
I'll put this in pending until someone can show how to reproduce this.

I tried using the Hive Mind mod to recreate this. But it just lets you place biter nests. It doesn't let you send out an expansion party. :-/

If there was a way to force sending out an expansion party to a particular spot, I could probably re-create this.