Switching from wiki or wysiwyg edit mode to in-place edit mode loose changes

To reproduce :
(in 18.2.0 : disable plugin xwiki-realtime in WYSIWYG Editor administration tab)

• Configure your user as Advanced User
• Edit a document in WYSIWYG or Wiki mode, add some text.
• Switch to In-Place edit by clicking the “Edit” button

Result : 

• The added text is not present

Expected :

Switching from WYSIWYG edit mode to Wiki mode (and reverse) does not lose the text added during the edit session. It should be the same when using the “Edit” button that switch to the In-Place edit mode.