Favorites don't display thumbnails

On nightly.nuxeo.com

1. login
2. click River.mp4 document
3. click the Add to favorites option in the top right part of the page
4. click the Recently viewed icon on the left panel
5. observe the document is listed with its thumbnail next to it
6. click the Favorites icon on the left panel
7. observe the document is listed but the thumbnail is not displayed

Expected behavior: the thumbnail should be displayed when listing the favorites.
Note: display should be aligned with nuxeo-recent-documents element:
https://github.com/nuxeo/nuxeo-web-ui/blob/9.10/elements/nuxeo-recent-documents/nuxeo-recent-documents.html#L85