[Bug] [Critical] 2.20.1 BlockTune and Default tunes disappear.

[kaaaaaaaaaaai]

@gohabereg

After I updated the version from 2.20.0 to 2.20.1, Tune disappeared.
Is it a bug?
It seems to happen only when using the BlockTuneAPI.

https://github.com/kaaaaaaaaaaai/editorjs-alignment-blocktune

ver2.20.0

  <script src="https://cdn.jsdelivr.net/npm/@editorjs/editorjs@2.20.0/dist/editor.min.js"></script>

ver2.20.1

  <script src="https://cdn.jsdelivr.net/npm/@editorjs/editorjs@2.20.1/dist/editor.min.js"></script>

[kaaaaaaaaaaai]

editor-js/link#48 same problems,
@talyguryn @neSpecc

 <script src="https://cdn.jsdelivr.net/npm/@editorjs/editorjs@2.20.1/dist/editor.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/@editorjs/header@latest"></script>

  <!-- Initialization -->
  <script>
    const saveButton = document.getElementById('saveButton');
    var editor = new EditorJS({
      holder: 'editorjs',
      tools: {
        header:Header
      },
      onReady: function(){
        saveButton.click();
      },
      onChange: function() {
        console.log('something changed');
      },
    });
    saveButton.addEventListener('click', function () {
      editor.save().then((savedData) => {
        cPreview.show(savedData, document.getElementById("output"));
      });
    });
  </script>