MediaUpload: cannot edit selected image in Add to Gallery view of media library

[ramonjd]

Description

Selecting an image and clicking on Edit Image in the Gallery Block Media Library throws a JS error.

The error is thrown at this line: https://github.com/WordPress/wordpress-develop/blob/2648a5f984b8abf06872151898e3a61d3458a628/src/js/media/views/edit-image.js#L25.

Step-by-step reproduction instructions

1. Insert a Gallery Block and add some images.
2. Select the Gallery Block
3. Click "Add" in the toolbar to open the Media Library
4. Select an image so that it has a blue border
5. Click on Edit Image

Screenshots, screen recording, code snippet

Environment info

• WordPress 5.9
• Gutenberg trunk

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[ramonjd]

Error in the console:

media-views.js?ver=6.1-alpha-53944:5375 Uncaught TypeError: Cannot read properties of undefined (reading 'toJSON')
    at n.prepare (media-views.js?ver=6.1-alpha-53944:5375:21)
    at n.render (wp-backbone.js?ver=6.1-alpha-53944:534:20)
    at n.editState (index.js:139:8)
    at p (backbone.min.js?ver=1.4.1:2:3736)
    at f (backbone.min.js?ver=1.4.1:2:3533)
    at a (backbone.min.js?ver=1.4.1:2:692)
    at e.trigger (backbone.min.js?ver=1.4.1:2:3423)
    at StateMachine.<computed> [as trigger] (media-views.js?ver=6.1-alpha-53944:2105:25)
    at Region.trigger (media-views.js?ver=6.1-alpha-53944:1777:21)
    at Region.render (media-views.js?ver=6.1-alpha-53944:1723:8)