Warning: DOMDocumentFragment::appendXML() when input is not normalized

I'm not sure if this should be the responsibility of the embedded_content module or the plugin creating the markup.

However I would like to be able to reproduce the issue on my local environment: Could you provide the exact steps to reproduce this issue, with module version numbers, themes and modules installed,

Thanks!

Drupal 10.3.6
'drupal/uswds_ckeditor_integration:3.0.2'
'drupal/embedded_content:2.0.1'

Basic HTML text format uses Embedded Content in CKEditor.

1. Create a new node (Basic Content)
2. Click the "Embedded Content" button in the CKEditor toolbar
3. Select "Accordion" for content type
4. Enter a heading and body, click "Embed"
5. Save the new node
6. Errors appear (see screenshot)

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