#format

Ah, thanks for connecting the dots in comment #4! Yes, the 7.x version of this module drops support for CKEditor 4, and the code triggering this problem is for the CKEditor 4 integration, so it can be removed in the 7.x branch. Sites that are *only* using CKEditor 5 presumably would not have this error, just sites that still have CKEditor 4 enabled somewhere.

Committed, and a release is forthcoming!

I have the same issue. The module file in 7.0 shows this line:

/**
 * Implements hook_ckeditor_plugin_info_alter().
 */
function linkit_ckeditor_plugin_info_alter(array &$plugins) {
  if (isset($plugins['drupallink'])) {
    $plugins['drupallink']['class'] = "Drupal\\linkit\\Plugin\\CKEditorPlugin\\LinkitDrupalLink";
  }
}

However, the plugin does not exist anymore. Can we just remove this line? I think core handles this now in ckeditor5.

Thanks for the report. Given the seemingly simple steps to reproduce, and the fact that this hasn't been an issue for other sites, I'm wondering if there's something specific to your site's configuration that is involved. Would you be able to test this in a generic Drupal 10.3.10 context (e.g., site install with the "standard" profile, no additional modules installed), and see if you can reproduce it in that context? Thanks!