Noise threshold customizing breaks mapgen?

[NetSysFire]

Describe the bug

I am playing around with the default region settings, aiming to reduce thick forest and having more sparse ones.

    "overmap_forest_settings": {
      "noise_threshold_forest": 0.2,
      "noise_threshold_forest_thick": 0.4,
      "noise_threshold_swamp_adjacent_water": 0.3,
      "noise_threshold_swamp_isolated": 0.99,
      "river_floodplain_buffer_distance_min": 3,
      "river_floodplain_buffer_distance_max": 15
    }

As you can see, my character is currently in thick forest, according to the map. The thick forest is not even generated though:

With these settings, all of the thick forest I could find are just fields. I do not know if this is a bug or if I am doing something wrong, since these settings are not well documented.

Steps to reproduce

1. Use the region settings I use.
2. Teleport to the nearest forest_thick terrain.
3. Witness the wasteland.

Expected behavior

There being thick forest. These are most definitely fields in disguise.

Screenshots

No response

Versions and configuration

• OS: Linux
  • OS Version: LSB Version: n/a; Distributor ID: Arch; Description: Arch Linux; Release: rolling; Codename: n/a;
• Game Version: 0.F-11996-gd0fa99b1bbb [64-bit]
• Graphics Version: Tiles
• Game Language: System language []
• Mods loaded: [ Dark Days Ahead [dda], region test [mymod] ]

Additional context

Edit: It broke swamps, too and I only messed with the isolated swamp setting aaaaaaaa

[NetSysFire]

Closing as user error. The noise is not responsible. It was because I only had forest defined in forest_mapgen_settings. forest is mandatory, but forest_thick and forest_water is not. Imo it should be mandatory unless its noise threshold is 1. It is inconsistent because everything else needs to be properly declared and defined.