[wp-trac] [WordPress Trac] #59057: Critical error after update to 6.3 due to WP_Metadata_Lazyloader

[WordPress Trac]

#59057: Critical error after update to 6.3 due to WP_Metadata_Lazyloader
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 Reporter:  alexpaterson  |       Owner:  joemcgill
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  6.3.1
Component:  General       |     Version:  6.3
 Severity:  critical      |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by Jeffinho2016):

 Tested this. On my side, I can confirm that it was third-party code the
 issue.
 Wordpress Shortinit includes meta.php by default, but not settings.php.
 Prior to 6.3, class-wp-metadata-lazyloader.php was added to the shortinit
 to get extra functions.
 Since class-wp-metadata-lazyloader.php is now loaded by meta.php, it also
 gets loaded by default in shortinit mode. So it was being loaded, but not
 by WP, but by a third-party that didn't update for 6.3.

 Replying to [comment:21 Jeffinho2016]:
 > Just wanted to give a quick update on my side for this. Thought maybe
 could help.
 > I found out that I have somewhere a piece of code that does a wordpress
 "SHORTINIT", and includes a bunch of other extra files than the ones
 included with the shortinit. One of these files is class-wp-metadata-
 lazyloader.php. And it is just behind a required, not a required_once.
 > Haven't tested yet to adjust that code, but i'm kind of 100% confident
 that it's the problem behind it. At least on my side.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59057#comment:24>
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