Mentions Filter causes error in ckeditor5

Problem/Motivation

I select ckeidtor5 for full_html or any other text format
I add "Mentions Filter"
Attempt to save and get an error:

The current CKEditor 5 build requires the following elements and attributes:
<br> <p> <h2> <h3> <h4> <h5> <h6> <strong> <em> <drupal-media data-entity-type data-entity-uuid alt data-caption data-align>
The following elements are missing:
<br> <p> <h2> <h3> <h4> <h5> <h6> <strong> <em> <drupal-media data-entity-type data-entity-uuid alt data-caption data-align>

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes