EmbedCKEditorPluginBase Error

I'm getting the exact same error. I even tried using switching over to Ckeditor 5 and get the same results.

There is a discussion about this issue in #3430097-45: Automated Drupal 11 compatibility fixes for embed → .

I backed out the commit in 1.8 ( 📌 Automated Drupal 11 compatibility fixes for embed Needs review ) that broke everything and released 1.9. Whoops!

Automatically closed - issue fixed for 2 weeks with no activity.