Insertion of   in editor when deleting characters

We detected a bug when a user deletes a character at the end of a word or simply a single character (can be a letter or a point etc.) In such cases a non break space is automatically inserted.

 

See screenshot :

The issue appears only on chrome browser.

Steps to reproduce :
XWiki : 9.8.1
CKEditor : 1.29
Chrome : 77.0.3865.90
OS : Ubuntu 18.04.3 LTS

1. Edit a wiki page that contains some content
2. Delete the last character of a given word of the page content and save the page.
3. In view mode and using the browser console check the text you modified in the step 2.

Expected result : The character at the end of the word was deleted
Actual result : At the point where you interfered a non break space was added

Apparently this issue is a CKEditor known bug, see https://dev.ckeditor.com/ticket/11415 and https://dev.ckeditor.com/ticket/9929.