TypeError in TinyMCE when changing the mimeType and pressing the Cancel button

1

TypeError in TinyMCE when changing the mimeType and pressing the Cancel button.

To reproduce it:

  1. Create Page
  2. Enter Title. Left other fields empty
  3. Save Page
  4. Edit Page
  5. Change text/html to text/x-web-textile
  6. Press Button Cancel

A TypeError is raised. See Webdeveloper Console:

Uncaught TypeError: s.tiny is undefined

This can be reproduced on Plone 6 Classic UI (e.g. on https://classic.demo.plone.org.)

Where should I post an issue?