"Publishing Failed" message. Yet, it did publish.

[mikewestcoast]

For the last several months (March-May 2019) in the Gutenberg Editor, once in a while, when you hit "Update", the Gutenberg Editor says "Publishing Failed". Yet, it IS publishing the update and publishing is NOT failing.

And once in a while when using the Classic Editor, after hitting the "Update" button, it will respond as if the update did not happen and claim an error occurred. After hitting "Update" a white blank screen will appear with this message at the top: "PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0". Yet, hitting back button and then clicking on "View Page", the changes did take place.

Any suggestions?

[pento]

Thank you for the bug report, @mikewestcoast!

As this is a sporadic issue, it may be a little tricky to debug. If you're able to reproduce it consistently, you can do the following:

• Open the developer tools in your browser.
• Edit and save a post in the block editor, in the same tab that developer tools are open.
• In developer tools, switch to the "Network" section, and look for a failing request (it will usually be highlighted in red).
• Copy the response content from the failed request to this ticket.

As you've also experienced similar issues with the classic editor, it may be a server side issue. Could you have a look through your PHP error logs, and see if there's anything listed when these errors have occurred?