Media not rendered in ckeditor

Problem/Motivation

When working with ckeditor media, the image previews are not rendered in ckeditor when working with image_sizes based styles.

The JS log says:
Found declarative shadowrootmode attribute on a template, but declarative Shadow DOM is not being parsed. Use setHTMLUnsafe() or parseHTMLUnsafe() instead. drupalMedia.js?su2z53:1

Steps to reproduce

- Create an image_sizes responsive image style.
- Use it in a media view mode on the image field formatter
- allow using this view mode in ckeditor media
- Select an image in ckeditor using this view mode