[wp-trac] [WordPress Trac] #59847: Since WordPress 6.4, the functions.php of a theme moved to a different location using register_theme_directory is no longer called

[WordPress Trac]

#59847: Since WordPress 6.4, the functions.php of a theme moved to a different
location using register_theme_directory is no longer called
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 Reporter:  partyfrikadelle             |       Owner:  joemcgill
     Type:  defect (bug)                |      Status:  reviewing
 Priority:  normal                      |   Milestone:  Awaiting Review
Component:  Bootstrap/Load              |     Version:  6.4
 Severity:  critical                    |  Resolution:
 Keywords:  has-patch needs-unit-tests  |     Focuses:  template,
                                        |  performance
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Comment (by kdowns):

 @joemcgill Had a thought about the memoization so drop it in here as a
 possible consideration going forwards. Previously,
 `get_stylesheet_directory()` always returned a string value regardless of
 the stack and how early it was called.

 With memoization and the proposed PR, there are cases when early calls to
 `get_stylesheet_directory()` will return as null. Are there potential
 concerns if the value is null on early calls? This doesn't directly affect
 anything I'm attempting to do on the plugin end as my hook will assign it
 as expected, but it might be something to consider from a higher WP level.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59847#comment:34>
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