The CKEditor v45 release creates a breaking change for the linkit decorator and additional attribute logic. When the link form is submitted, it now passes an additional displayedText argument with the submit arguments. Linkit has logic based on the length of the arguments object. Specifically, Linkit attempts to access or modify the decorators object, assuming it's the last item, which is now the displayedText argument, not the decorators object.
See the CKEditor5 LinkCommand docs for more details: https://ckeditor.com/docs/ckeditor5/latest/api/module_link_linkcommand-L...
Currently, you would need to manually update to CKEditor v45 to reproduce this, but the added bookmarks functionality is a great win, and v45 offers an improved link experience.
and also to `linkediting.js::_addExtraAttributesOnLinkCommandExecute`
In future releases, the affected logic should be updated to specifically reference the execute arguments link decorator object instead of using object length-derived solutions.
Active
6.1
User interface