[wp-trac] [WordPress Trac] #57630: Site Editor: Template part customization is not saved for certain child themes

[WordPress Trac]

#57630: Site Editor: Template part customization is not saved for certain child
themes
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 Reporter:  mreishus          |       Owner:  (none)
     Type:  defect (bug)      |      Status:  new
 Priority:  normal            |   Milestone:  6.2
Component:  Themes            |     Version:  trunk
 Severity:  normal            |  Resolution:
 Keywords:  has-testing-info  |     Focuses:
------------------------------+---------------------
Changes (by hellofromTonya):

 * keywords:   => has-testing-info


Comment:

 == Reproduction Report
 This report validates that the issue can be reproduced.

 === Environment
 * OS: macOS
 * Web Server: wp-env (Docker)
 * WordPress: `trunk`
 * Browser: Firefox 110.0.1
 * Theme: Twenty Twenty-Two (Red) - WordPress.com version 1.0
 * Active Plugins: none

 === Actual Results
 - ✅ Yes, I can reproduce the reported issue.

 See it in action: [attachment:"57630-reproduce1.gif"]

 - Also, changes to the parent's Header template part do not save on
 repeated attempts.

 See it in action: [attachment:"57630-parent-header-reproduce.gif"]

 === Additional Notes
 - The TT2 (Red) theme is a child theme that has 2 template parts:
    - `header-large-dark.html`
    - `header-small-dark.html`
 - The parent theme has the following template parts:
    - `header.html`
    - `header-large-dark.html`
    - `header-small-dark.html`

 Changes to the child theme's template parts do save on the 1st and
 multiple saves. But changes to the parent's `header.html` template part
 does not save on any save attempt.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57630#comment:4>
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