Error publishing post after updating wordpress. ReferenceError: regeneratorRuntime is not defined

[Justin.Reinhart]

Ever since updating to WordPress 5, I believe--whichever major revision came out a month or so ago, when the WYSIWYG editor radically changed--I have not been able to publish my posts. When I click the "Publish" button I get an error box asking me to copy the error or attempt recovery. The text below is a copy of the error.

I waited to report this because I assumed other people would be experiencing it too and it would just be fixed with an update, but I'm still unable to publish posts.

ReferenceError: regeneratorRuntime is not defined
    at Array.E (https://www.justinreinhart.com/wp-content/plugins/jetpack/_inc/blocks/editor.js?ver=7.4:24:187630)
    at Array.REFRESH_CONNECTION_TEST_RESULTS (https://www.justinreinhart.com/wp-content/plugins/jetpack/_inc/blocks/editor.js?ver=7.4:24:188075)
    at Object.dispatch (https://www.justinreinhart.com/wp-content/plugins/jetpack/_inc/blocks/editor.js?ver=7.4:24:45350)
    at Object.refreshConnections (https://www.justinreinhart.com/wp-includes/js/dist/data.min.js?ver=4.4.0:1:6723)
    at n.value (https://www.justinreinhart.com/wp-includes/js/dist/data.min.js?ver=4.4.0:1:17246)
    at t.value (https://www.justinreinhart.com/wp-content/plugins/jetpack/_inc/blocks/editor.js?ver=7.4:24:189476)
    at qi (https://www.justinreinhart.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.8.4:130:198)
    at ui (https://www.justinreinhart.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.8.4:133:320)
    at https://www.justinreinhart.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.8.4:158:377
    at unstable_runWithPriority (https://www.justinreinhart.com/wp-includes/js/dist/vendor/react.min.js?ver=16.8.4:27:36)

[Justin.Reinhart]

Screenshot

[Justin.Reinhart]

Reproducible error in:
Chrome Version 74.0.3729.169 (Official Build) (64-bit)
Firefox Quantum 67.0 (64-bit)

Windows 7 64-bit

[SergeyBiryukov]

Hi Justin.Reinhart, welcome to WordPress Trac! Thanks for the report.

Based on the stack trace, the error comes from the Jetpack plugin, not from WordPress core. This Trac is used for enhancements and bug reporting for the WordPress core software, not for third-party plugins like Jetpack or general support questions.

Please try the plugin ​support forums to get help with fixing the issue on your site.