[wp-trac] [WordPress Trac] #54907: After upgrading to 5.9 I get blank screens when trying to edit or add posts

[WordPress Trac]

#54907: After upgrading to 5.9 I get blank screens when trying to edit or add posts
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 Reporter:  eTurboNews       |       Owner:  (none)
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Upgrade/Install  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by eTurboNews):

 MY staging site is 2 years old.
 I can of course clone this one = it will take hours because of the size.
 Perhaps the only way out is the restore from our earlier back up with the
 previous WP version and we will lose today's news articles.?

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Ticket URL: <https://core.trac.wordpress.org/ticket/54907#comment:5>
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