REGEX_CLICKABLE_CLASS in exported settings is an empty object

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Steps to reproduce

1. Set a custom REGEX_CLICKABLE_CLASS
2. Export settings

Description

When settings are exported, .debug.ElementManager.REGEX_CLICKABLE_CLASS is {} instead of the user's setting (example:
LinkHints-options-2023-08-01.json.gz).

Debug info

Debug info

{
  "version": "1.3.1",
  "browser": "firefox",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0",
  "browserInfo": {
    "name": "Firefox",
    "vendor": "LibreWolf",
    "version": "115.0.2-2",
    "buildID": "20230712143257"
  },
  "platformInfo": {
    "os": "linux",
    "arch": "x86-64"
  },
  "storage.sync": {
    "debug.ElementManager.ATTRIBUTES_CLICKABLE": [
      "aria-checked",
      "aria-selected",
      "data-dismiss",
      "data-ember-action",
      "data-image-url",
      "data-line-number",
      "data-permalink-path"
    ],
    "css": ".root {\n    /* https://github.com/lydell/LinkHints/issues/82 */\n    text-shadow: initial;\n}",
    "hints.shift-Enter": "ActivateHint",
    "debug.ElementManager.ROLES_CLICKABLE": [
      "button",
      "checkbox",
      "link",
      "menuitem",
      "menuitemcheckbox",
      "menuitemradio",
      "option",
      "radio",
      "searchbox",
      "spinbutton",
      "switch",
      "tab",
      "textbox"
    ],
    "normal.ctrl-j": "EnterHintsMode_Click",
    "normal.ctrl-k": "EnterHintsMode_BackgroundTab",
    "normal.ctrl-J": "EnterHintsMode_ManyClick",
    "normal.ctrl-K": "EnterHintsMode_ManyTab",
    "normal.ctrl-L": "EnterHintsMode_Select",
    "normal.ctrl-:": "EnterHintsMode_ForegroundTab",
    "hints.ctrl-Enter": "ActivateHintAlt",
    "hints.shift-Backspace": "Backspace",
    "debug.ElementManager.REGEX_CLICKABLE_CLASS": "\\bcm-|ͼ|\\bmtk|sparkline-year-label|js-wiki-toggle-collapse"
  },
  "storage.local": {
    "tutorialShown": true
  },
  "language": "en-US"
}