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Changes between Initial Version and Version 1 of Ticket #60025, comment 5

initial	v1
28	28	}}}
29	29
30		As best as we can figure, what appears to be happening is that there is a function is_child_theme() in wp-includes/theme.php which has changed. It had been dependent upon two global constants (STYLESHEET~~DIR and TEMPLATEDIR~~), but now it is using the functions get_template_directory() and get_stylesheet_directory().
	30	As best as we can figure, what appears to be happening is that there is a function is_child_theme() in wp-includes/theme.php which has changed. It had been dependent upon two global constants (STYLESHEETPATH and TEMPLATEPATH), but now it is using the functions get_template_directory() and get_stylesheet_directory().
31	31
32	32	In the past the two global constants were being set by calling the same functions, but likely before the theme was loaded or initialized. In WP 6.3 and earlier, the is_child_theme() function call returned false. Now that function call is returning true.