Natural monster spawn location clustering

[Coolthulhu]

To see it, open debug menu and select show hordes (it shows all the spawn locations, not just hordes).
They are not spread evenly (or even semi-evenly) across the space they should cover, but instead form 3x3 squares, with 8 tiles between centers.

This square pattern covers swamps, rivers and mansions placed on swamps.
It is visible in game too - fish form square "blocks" in the river, with fuzzy but obvious sides.

Most hive type groups (fungi, ants etc.) are spread in proper circular patterns. With the exception of bee hive, which gets all the spawn groups clustered in its upper left corner.

[hexagonrecursion]

Confirmed

• OS: Linux
  • OS Version: LSB Version: :core-4.1-amd64:core-4.1-noarch; Distributor ID: Fedora; Description: Fedora release 34 (Thirty Four); Release: 34; Codename: ThirtyFour;
• Game Version: eacb7d9 [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  No Fungal Growth [no_fungal_growth],
  Bionic Professions [package_bionic_professions]
  ]

[stubkan]

Well, this is only for fish, because they are created in a 3x3 square. Then they don't move around.

It is only zombie hordes, nemesis or npcs that move over the overmap. Ant, blob and fungus hordes are created around their spawn point and those don't move either.

I don't think this is worth being a bug. If the square shape is a bother, then they just need to not spawn in that shape.