Clicking "Back To Edit" button when previewing a page automatically joins the collaborative session although it was left voluntarily by the user

Steps to reproduce

1. Edit a page in WYSIWYG mode (not in-place)
2. Un-tick "Allow Realtime Collaboration" box
3. Click "Leave the collaborative session" button
4. Click "Preview" button
5. Click "Back To Edit" button

Expected results

The user is directed to page WYSIWYG edit mode in the same previous state that was before clicking "Preview" button - outside of the collaborative session.

Actual results

The user is directed to page edit mode and automatically joined to the collaborative session (the "Allow Realtime Collaboration" box is ticked), although he voluntarily left it before previewing the page.

Reproduced also on XWiki 16.4.6 with realtime editing mode active (it's not activated by default).