Attribute "levels" prevents generation

[PpChailley]

1. parameter setting seems to not work
2. documentation should be updated -> https://packagecontrol.io/packages/MarkdownTOC#control-of-levels-listed-in-toc

How can the issue be reproduced

• Set configuration item levels="1,2" either in Packages/User/MarkdownTOC.sublime-settings or as a XML comment (<!-- MarkdownTOC style="ordered" levels="1,2" -->)
  • Also tried with syntax levels="[1,2]"
  • Strangely enough, global config file (default values) includes "levels": [1,2,3,4,5,6], which doesn't prevent normal generation
• Generate or regenerate TOC through Sublime menus

**Using the syntax default.levels="1,2" in XML comment, it works as expected. **
Using similar redundant syntax in config files does not work

"defaults": 
  {
    "default.levels": "1",
    ...
  }

Context

Packages/MarkdownTOC/MarkdownTOC.sublime-settings

{
  "defaults": {
    "autoanchor": false,
    "autolink": false,
    "bracket": "round",
    "levels": [1,2,3,4,5,6],
    "indent": "\t",
    "remove_image": true,
    "link_prefix": "",
    "bullets": ["-"],
    "lowercase": "only_ascii",
    "style": "unordered",
    "uri_encoding": true,
    "markdown_preview": ""
  },
  "id_replacements": [
    {
      "pattern": "\\s+",
      "replacement": "-"
    },
    {
      "pattern": "&lt;|&gt;|&amp;|&apos;|&quot;|&#60;|&#62;|&#38;|&#39;|&#34;|!|#|$|&|'|\\(|\\)|\\*|\\+|,|/|:|;|=|\\?|@|\\[|\\]|`|\"|\\.|\\\\|<|>|{|}|™|®|©|%",
      "replacement": ""
    }
  ],
  "logging": false
}

Packages/User/MarkdownTOC.sublime-settings

{
  "defaults": 
  {
    "autolink": true,
    "autoanchor": true,
    // "bracket": "square",
    // "levels": "1,2",
    "indent": "    ",
    // "remove_image": false,
    // "bullets": "*",
    "style": "unordered",


  },
  "id_replacements": 
  [
    {
      "pattern": "\\s+",
      "replacement": "-"
    },
    {
      "pattern": "&lt;|&gt;|&amp;|&apos;|&quot;|&#60;|&#62;|&#38;|&#39;|&#34;|!|#|$|&|'|\\(|\\)|\\*|\\+|,|/|:|;|=|_|\\?|@|\\[|\\]|`|\"|\\.|<|>|{|}|™|®|©",
      "replacement": ""
    },
    {
      "pattern": "&eacute;|é|&egrave;|è|&ecirc;|ê",
      "replacement": "e"
    },
    {
      "pattern": "&aacute;|&agrave;|à|&acirc;|â",
      "replacement": "a"
    }


  ],

}

What was expected

TOC should be (re)generated with appropriate levels included

What actually occurred

As soon as this config item is specified (either un user config file or XML comment), generating the TOC doesn't work (no change in file)
Strangely, the parameter exists in global config file and it stil works

What was the version of the involved component

Markdown TOC v4.1.2
Sublime text build 4143
win10