Assets Files do not load inside the responsive editor iframe after WP 5.9 update.

[RajkiranBagal]

Description

We have used the enqueue_block_editor_assets hook & enqueued a CSS file inside that.

That CSS file successfully loads inside the editor on Desktop preview.

When we switch the preview to Mobile/Tablet then all the Markup is loaded inside an iframe, but the CSS file is not loaded inside it.

Due to which, it breaks things on responsive mode.

Step-by-step reproduction instructions

1. Enqueue any CSS file using wp_enqueue_style function on enqueue_block_editor_assets hook.
2. Go to the Editor, On Desktop you will the file is loading.
3. Now switch preview to Tablet/Mobile.
4. The CSS file will not load inside the iframe.

Screenshots, screen recording, code snippet

No response

Environment info

• Using Gutenberg version 13.0.0
• Issue reproduces on both Google Chrome & Mozilla Firefox browsers when the Gutenberg plugin is active.
• When Gutenberg Plugin is deactivated it only reproduces on the Mozilla Firefox browser.

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

[ALJ]

This might be a duplicate of #38673

[ndiego]

Yes, this appears to be a duplicate of #38673. Since more discussion is taking place on that issue, I am going to close this in favor of #38673. Thank you for reporting this @RajkiranBagal! Keep an eye on the other issue as we work towards a solution.