[wp-trac] [WordPress Trac] #52757: 5.7 issue: Updating failed. The response is not a valid JSON response.

[WordPress Trac]

#52757: 5.7 issue: Updating failed. The response is not a valid JSON response.
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 Reporter:  ludvickk      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  5.7
 Severity:  critical      |   Keywords:
  Focuses:                |
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 https://wordpress.org/support/topic/known-issues-with-wp-5-7/

 See my comment:
 I have that issue even when I don’t have “Featured Image Pro Post Grid”
 plugin. I think it’s global WordPress 5.7 problem. I hope it will be fixed
 as soon as possible by WordPress creators.

 I think it's global WordPress 5.7 problem, solutions not working and
 before problem not existed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52757>
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