[wp-trac] [WordPress Trac] #59723: Pattern file containing PHP constant from theme causes fatal error on update to WordPress 6.4

[WordPress Trac]

#59723: Pattern file containing PHP constant from theme causes fatal error on
update to WordPress 6.4
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 Reporter:  fabiankaegy                          |       Owner:  joemcgill
     Type:  defect (bug)                         |      Status:  accepted
 Priority:  high                                 |   Milestone:  6.4
Component:  Upgrade/Install                      |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch changes-requested needs-   |     Focuses:
  testing has-testing-info                       |
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Comment (by fabiankaegy):

 Replying to [comment:10 pbiron]:
 > = Steps to reproduce
 >
 > 1. start w/ a fresh site running 6.3.2
 > 2. install/activate the sample theme in comment:2
 > 3. update to 6.4-RC2 via WP_CLI, `wp core update --version=6.4-RC`
 > 4. check the PHP error logs, and notice `PHP Fatal error:  Uncaught
 Error: Undefined constant "NAMESPACE_IMAGE_URL" in path-to-site/wp-
 content/themes/wp-core-59723-sample-theme-main/patterns/sample.php:9`
 >
 > = Steps to test the [https://github.com/WordPress/wordpress-
 develop/pull/5568 PR]
 > 1. roll the site back to 6.3.2, `wp core update --version=6.3.2 --force`
 >    a. note: another error will be logged, you can ignore it the purposes
 of this testing
 > 2. update `wp-includes/block-patterns.php` in the WP_CLI ZIP file in
 `~/.wp-cli/cache/core/wordpress-6.4-RC2-en_US.zip` so that the PR has been
 applied (i.e., add the early return from
 `_register_theme_block_patterns()` if `wp_is_installing()` is true)
 > 3. clear your PHP error log file
 > 4. update to 6.4-RC2, `wp core update --version=6.4-RC2`
 > 5. check the PHP error logs and notice no error was logged

 Following these test steps I am also no longer able to reproduce the issue
 :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/59723#comment:24>
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