Story Block: be more defensive to avoid error in block previews

[jeherve]

Fixes #39694

Proposed changes:

This should avoid this error when previewing the block's styles in the site editor.

Uncaught DOMException: Node.removeChild: The node to be removed is not a child of this node

The above error occurred in the <Modal> component:

Zg@http://localhost/wp-content/plugins/gutenberg/build/vendors/react-dom.js?ver=18:1:217152
Zg@http://localhost/wp-content/plugins/gutenberg/build/vendors/react-dom.js?ver=18:1:217854
ExpandableSandbox@http://localhost/wp-content/plugins/jetpack/_inc/blocks/editor-beta.js?minify=false&ver=f3e463dd15d69dcf859c:74666:27
StoryPlayer@http://localhost/wp-content/plugins/jetpack/_inc/blocks/editor-beta.js?minify=false&ver=f3e463dd15d69dcf859c:74771:21
div
StoryEdit@http://localhost/wp-content/plugins/jetpack/_inc/blocks/editor-beta.js?minify=false&ver=f3e463dd15d69dcf859c:73921:151

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

• No

Does this pull request change what data or activity we track or use?

• No

Testing instructions:

Note

This can only be tested if your site runs Gutenberg trunk right now.

You can see how the error can be reproduced in this video: #39694 (comment)

1. Go to Appearance > Site Editor
2. Click on the Style icon in the top right corner.
3. Click on the Eye icon in the Styles sidebar.
4. Click on the Media tab to preview the Story block
   • You should be able to see the Story block with no issues

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the fix/story-block-fatal branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack fix/story-block-fatal
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

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[coder-karen]

This tests well for me 👍