[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:  (none)
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Bootstrap/Load   |     Version:  6.4
 Severity:  critical         |  Resolution:
 Keywords:                   |     Focuses:  template
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Comment (by coreyw):

 All of our sites have or will be broken by this update as well. This has
 to do with the new memoization of the `get_stylesheet_directory()` and
 `get_template_directory()` functions. They only memoize if there are no
 filters applied on `template`, `theme_root`, or `template_directory`, but
 the first call to these functions runs even before must-use plugins, thus
 they always cache the first result which is the default theme directory
 and then causes `register_theme_directory` to be useless. Huge oversight
 to release this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59847#comment:1>
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