Description

@font-face CSS not loading in page editor when in desktop preview for existing websites.

• Fonts visible wjhen switching to mobile, tablet preview
• wp-edit-post-js-after styles contain reference in __unstableResolvedAssets
• Noted on existing gutenberg enabled websites (mu and single)
• Iframe does not appear to load for desktop preview
• Disabling gutenberg plugin fixes issue
• changing text element font style in preview mode creates error

Step-by-step reproduction instructions

Not reproduceable - effects existing websites

Screenshots, screen recording, code snippet

GIST contining wp-edit-post-js-after data: https://gist.github.com/djcowan/55252ddedaa412512c15535f8e6af36e

Environment info

• Version 15.8.1 | By Gutenberg Editor Team
• Wordpress Version 6.2.2
  Is this site using HTTPS?
  Yes
  Is this a multisite?
  Yes

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

Yes

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

No