Click to Tweet blocks show blank on my page. I have the Click to Tweet plugin installed. Is that a problem? Or could this be incompatibility with the theme?

On this page, I uploaded the screenshots for this quirk, so you can compare the Click to tweet text and the tweet created. Both hashtag are missing.

Hi Rick, I love the plugin and it seems to work well.

The “via @twitteraccount” did not work, however. Then maybe I had forgotten to add the @ sign with the twitter account? So I went and edited it.
Then I received an “Updating failed” error prompt.

Here is the error message from the browser console:

/~gutenbe4/wp-content/plugins/jetpack/modules/after-the-deadline/tinymce/plugin.js?v=20150715&wp-mce-4607-20171116:68 Uncaught TypeError: editor.getParam(…).join is not a function
at initAtDCore (/~gutenbe4/wp-content/plugins/jetpack/modules/after-the-deadline/tinymce/plugin.js?v=20150715&wp-mce-4607-20171116:68)
at q.<anonymous> (/~gutenbe4/wp-content/plugins/jetpack/modules/after-the-deadline/tinymce/plugin.js?v=20150715&wp-mce-4607-20171116:311)
at b.e [as fire] (tinymce.min.js:27)
at q.fire (tinymce.min.js:27)
at B (tinymce.min.js:33)
at tinymce.min.js:33
at tinymce.min.js:3
at tinymce.min.js:3
/~gutenbe4/wp-json/wp/v2/posts/43 Failed to load resource: the server responded with a status of 500 (Internal Server Error)

How can I help troubleshooting this further?

Birgit