[wp-trac] [WordPress Trac] #55015: Site Editor not working for TwentyTwentyTwo Child theme

[WordPress Trac]

#55015: Site Editor not working for TwentyTwentyTwo Child theme
---------------------------+---------------------
 Reporter:  mervinpraison  |       Owner:  (none)
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  5.9.1
Component:  Themes         |     Version:  5.9
 Severity:  major          |  Resolution:
 Keywords:  needs-patch    |     Focuses:
---------------------------+---------------------
Changes (by costdev):

 * keywords:  reporter-feedback => needs-patch
 * milestone:  Awaiting Review => 5.9.1


Comment:

 Thanks for the information @mervinpraison!

 == Test Report

 === Env
 * WordPress 5.9
 * [https://roots.io/bedrock/ Roots Bedrock]
 * Chrome 97.0.4692.99
 * WSL2
 * Theme: [https://github.com/WordPress/theme-experiments/tree/add/tt2
 -child-themes/twentytwentytwo-swiss Twenty Twenty-Two (Swiss)] and a
 custom child theme with the "Template: twentytwentytwo" header.
 * Block Editor
 * Plugins: With and without Gutenberg 12.4.1.

 === Steps to test
 1. Set up Roots Bedrock following the installation guide.
 2. Follow the normal WordPress install.
 3. Clone Twenty Twenty-Two (Swiss) into `bedrock/web/app/themes/`.
 4. Navigate to `Appearance > Themes` and activate `Twenty Twenty-Two
 (Swiss)`.
 5. Navigate to `Appearance > Editor`.

 The Editor should fail to load.
 Open DevTools. You should see the error in the screenshot attached to this
 ticket.

 6. Create a new theme folder in `bedrock/web/app/themes/` and add a
 `style.css` file with the following:

 {{{#!css
 /*
  * Theme Name: TT2 - Child Theme
  * Template:   twentytwentytwo
  */
 }}}

 7. Activate the theme.
 8. Visit the Site Editor.

 The same issue should occur.

 === Results
 - The Site Editor loads for Twenty Twenty-Two.
 - The Site Editor does not load when using a child theme for Twenty
 Twenty-Two ✅

 ----

 Milestoning for 5.9.1 to raise awareness of this issue and aid
 investigation.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55015#comment:4>
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