Split config: module.toml doesn't work, but module.yaml does

Ok so initially I was going to make a case stating that modules don’t seem to work with split config.
Then for lols I tried making a module.yaml and was surprised to see it worked.

I’ve made a simple example repo of my issue:

I have the two files:

config/_default/module.toml

[[module.mounts]]
  disableWatch = false
  lang = ''
  source = 'toml/content'
  target = 'content'

config/_default/module.yaml

mounts:
- disableWatch: false
  excludeFiles: null
  includeFiles: null
  lang: ""
  source: yaml/static
  target: static

And to my surprise only the module.yaml seems to be able to set any config.
I use this language, cause module.toml is clearly parsed, cause if we add f.x. another target = 'content' to it, the parser complains when Unmarshaling. So it is clearly parsed, just not honored.

Output from hugo config mounts:

❯ hugo config mounts
{
   "path": "project",
   "version": "",
   "time": "0001-01-01T00:00:00Z",
   "owner": "",
   "dir": "/Users/repsej/dev/personal/hugo/hugo-split-config-module.toml",
   "mounts": [
      {
         "source": "yaml/static",
         "target": "static"
      },
      {
         "source": "content",
         "target": "content"
      },
      {
         "source": "data",
         "target": "data"
      },
      {
         "source": "layouts",
         "target": "layouts"
      },
      {
         "source": "i18n",
         "target": "i18n"
      },
      {
         "source": "archetypes",
         "target": "archetypes"
      },
      {
         "source": "assets",
         "target": "assets"
      }
   ]
}

Glad I noticed .yaml was honored, then I am not blocked. But still baffling and wanted to report it.

Thanks for making Hugo

from Configuration Introduction

Omit the root key
When splitting the configuration by root key, omit the root key in the component file.

try this in config/_default/module.html

[[mounts]]
  disableWatch = false
  lang         = ''
  source       = 'toml/content'
  target       = 'content'
[[mounts]]
  disableWatch = false
  lang         = ''
  source       = 'yaml/static'
  target       = 'static'
> hugo config mounts
"mounts": [
  {
    "source": "toml\\content",
    "target": "content"
  },
  {
    "source": "yaml\\static",
    "target": "static"
  }...

Aaah yes!
It was me being bad with toml, I only dropped the [module] at the top.

Thanks irkode.