[wp-trac] [WordPress Trac] #55195: Calling `::parent()` on a child theme object where parent theme is missing `index.php` returns false in WP5.9

[WordPress Trac]

#55195: Calling `::parent()` on a child theme object where parent theme is missing
`index.php` returns false in WP5.9
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 Reporter:  robdxw        |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  6.1
Component:  Themes        |     Version:  5.9
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by audrasjb):

 Good to know that the issue was resolved, though I can't see any change to
 this function since 5.9 using GIT blame: https://github.com/WordPress
 /wordpress-develop/blame/trunk/src/wp-includes/theme.php.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55195#comment:9>
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