ckeditor_stylesheets cache busting

I added my theme css using the following in the *.info.yml:

ckeditor_stylesheets:
  - css/style.css

While updating the css/style.css I found that my changes wasn't reflecting into the WYSIWYG editor. Watching at the html head of the editor iframe I found that my css file was include as follow:

<link type="text/css" rel="stylesheet" href="/my_project/docroot/themes/unepmap/css/style.css">

That is, the above isn't included with any cache busting as any of the other css includes!?...

Now, not sure what is supposed to do CKEDITOR.timestamp included in #2679903: CKEditor uses separate cache-busting query string from Drupal's but it doesn't seems to cover the the above...