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I am also experiencing the same issue:

Drupal 9.4.13
PHP 8.0.27
Version: 2.0.0-alpha3

Using the Opigno distribution, when I go to add a new Question Set OR when I try to load an existing Question Set I get the following Errors in the console:

GET https://libraries/H5PEditor.TableList-1.0/h5p-editor-table-list.css?ver=... net::ERR_NAME_NOT_RESOLVED
GET https://libraries/H5PEditor.RangeList-1.0/h5p-editor-range-list.css?ver=... net::ERR_NAME_NOT_RESOLVED
GET https://libraries/H5PEditor.ShowWhen-1.0/h5p-show-when.css?ver=1.0.9 net::ERR_NAME_NOT_RESOLVED
GET https://libraries/FontAwesome-4.5/h5p-font-awesome.min.css?ver=4.5.4 net::ERR_NAME_NOT_RESOLVED
GET https://libraries/H5PEditor.VerticalTabs-1.3/styles/css/vertical-tabs.cs... net::ERR_NAME_NOT_RESOLVED
GET https://libraries/H5PEditor.QuestionSetTextualEditor-1.3/dist/question-s... net::ERR_NAME_NOT_RESOLVED

The functionality for the call is here:
/modules/contrib/h5p/vendor/h5p/h5p-editor/scripts/h5peditor.js

This is where the code seems to have issues:

ns.libraryRequested = function (libraryName, callback) {
  var libraryData = ns.libraryCache[libraryName];

  if (!ns.libraryLoaded[libraryName]) {
    // Add CSS.
    if (libraryData.css !== undefined) {
      libraryData.css.forEach(function (path) {
        if (!H5P.cssLoaded(path)) {
          H5PIntegration.loadedCss.push(path);
          if (path) {
            ns.$('head').append('<link ' +
              'rel="stylesheet" ' +
              'href="' + path + '" ' +
              'type="text/css" ' +
              '/>');
          }
        }
      });
    }

    // Add JS
    var loadingJs = false;
    if (libraryData.javascript !== undefined && libraryData.javascript.length) {
      libraryData.javascript.forEach(function (path) {
        if (!H5P.jsLoaded(path)) {
          loadingJs = true;
          ns.loadJs(path, function (err) {
            if (err) {
              console.error('Error while loading script', err);
              return;
            }

The libraryData.css & libraryData.javascript for me is the following:
[
"//libraries/H5PEditor.TableList-1.0/h5p-editor-table-list.css?ver=1.0.4",
"//libraries/H5PEditor.RangeList-1.0/h5p-editor-range-list.css?ver=1.0.12",
"//libraries/H5PEditor.ShowWhen-1.0/h5p-show-when.css?ver=1.0.9",
"//libraries/FontAwesome-4.5/h5p-font-awesome.min.css?ver=4.5.4",
"//libraries/H5PEditor.VerticalTabs-1.3/styles/css/vertical-tabs.css?ver=1.3.9"
]
[
"//libraries/H5PEditor.QuestionSetTextualEditor-1.3/dist/question-set-textual-editor.js?ver=1.3.8",
"//libraries/H5PEditor.TableList-1.0/h5p-editor-table-list.js?ver=1.0.4",
"//libraries/H5PEditor.RangeList-1.0/h5p-editor-range-list.js?ver=1.0.12",
"//libraries/H5PEditor.ShowWhen-1.0/h5p-show-when.js?ver=1.0.9",
"//libraries/H5PEditor.VerticalTabs-1.3/vertical-tabs.js?ver=1.3.9",
"//libraries/H5P.QuestionSet-1.17/presave.js?ver=1.17.1"
]

1. The libraryData.css.forEach && libraryData.javascript.forEach is looping through each of these index's
2. The function H5P.cssLoaded(path) && H5P.jsLoaded(path) (found in web/modules/contrib/h5p/vendor/h5p/h5p-core/js/h5p.js) determines the position of an element in the array (it would return 0-5, and 0-4 respectfully)
3. The function ns.loadJs (found in web/modules/contrib/h5p/vendor/h5p/h5p-editor/scripts/h5peditor.js) takes in the index we are at in the array, and is creating a new script element.

My Analysis:
I believe the ns.loadJs is where our issue occurs.

I am not sure why.

Same issue on alpha3 version.

I see that patch #11 doesn't works over h5p works, looks that works for a some distribution.

this patch is for h5p 2.0.0 branch