In some cases, if there is issue in code or whatever, and try to update the post in Gutenberg post-editor, you will get "Updating failed" error message:

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Is there any way to debug/find out the reason (i.e. in console) what error happened there or what was the response from the erroneous page?

  • I know this as a result of a too strict security mod on Apache. – leymannx Apr 22 at 18:19

You could poke around in the Network tab. Filter the requests by XHR. You can view the headers and the Response from there.

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I think I read somewhere that error reporting is something Gutenberg dev is planning on improving in the future.

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