[wp-trac] [WordPress Trac] #59436: "The response is not a valid JSON response"

[WordPress Trac]

#59436: "The response is not a valid JSON response"
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 Reporter:  egzaltowana   |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  6.3.1
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 After update to WordPress 6.3.1 I am not able to edit posts. I needed to
 install plug in which make on my page only classic editor. After trying to
 post/edit something without it, I get info: "“Updating failed. The
 response is not a valid JSON response”.

 I checked WordPress forum, and I am not the only one with the issue after
 6.3.1 installation. I also perform troubleshooting describes in many
 articles like: tirn off all plug-ins or edit .htaccess file.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59436>
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