[wp-trac] [WordPress Trac] #54230: Block based widgeteditor can't update "Not a valid JSON response"

[WordPress Trac]

#54230: Block based widgeteditor can't update "Not a valid JSON response"
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 Reporter:  davidlarssonback  |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  General           |    Version:  5.8.1
 Severity:  normal            |   Keywords:
  Focuses:  rest-api          |
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 When editing widgets with the new blockbased widgeteditor I can not
 update. I get the error "Not a valid JSON response".

 I **can** publish and update posts and pages.
 I **can** edit and update widgets from the customizer.

 I have tried chaging permalink settings. Even with permalinks set to plain
 I still get the same error when I use the widgeteditor.

 Site is running on an ISS server.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54230>
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