[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:  Widgets            |     Version:  5.8.1
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
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Comment (by cstrathmeyer):

 Same issue here, but the issue began with the automatic update to
 WordPress 5.9.0 on January 26, 2022. I was previously running 5.8.3.
 Previously, I could edit theme widgets successfully via either Appearance
 | Widgets or Appearance | Customize.

 I am using a Theme Spiral theme called TimesNews Pro.

 I have the same problem with the Widget Block Editor as the OP. I can open
 a widget in Appearance | Widgets and I can edit the content of the widget
 using the widget block editor. But when I click Update, I get the same
 JSON error as the previous posters. The screen recording submitted by
 @joegasper is exactly the error message I am seeing.

 Like the other posters, I can successfully edit the widget and save the
 new content via Appearance | Customize.

 --Carl

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Ticket URL: <https://core.trac.wordpress.org/ticket/54230#comment:7>
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