WYSIWYG deletes typed text due to fake table selection

Prerequisites:

• XWiki 15.10.11
• Any supported web-browser latest version (MS Edge, GG, Firefox)
• Being logged as XWiki Admin

Steps to reproduce:

1. Navigate to any Sandbox test page and trigger in-line editing
2. Create an empty table either from QA (quick action) or from the CKEditor toolbar icon with the default size
3. Fill the first cell in the first row with one-line text or doubled line text as you prefer
4. Trigger context menu on changed cell Row → Insert row before
5. Either move the cursor into an inserted row (before) or next row (after), and type any text or word, in the end press backspace button

Actual result

The text you put before will be deleted, although backspace was not clicked on that cell/row.

Expected result

The text of the previous cell is not deleted.

Note

I don't reproduce the error in CKEditor 4 demo.