Use CKEditor 5 with comments

Seems to be an issue of:

  var getCkeditor = function (){
    return window.CKEDITOR || {
      on: function(event, callback) {
        callback();
      },
      instances: {}
    };
  }

in

social_mentions:
  js:
    js/social_mentions.js: {}

@slowflyer the issue seem to be in social_mentions.js
It works after I replace CKEDITOR.instances[this.id] with Drupal.CKEditor5Instances.get(this.id)
See more https://www.drupal.org/project/drupal/issues/3388485#comment-15471223 📌 Document in ckeditor5.api.php how to access the CKEditor 5 instance given a DOM element Active