Page leaving confirmation box is displayed when saving a page after adding or removing an object in IE11

STEPS TO REPRODUCE

1. Access the instance with IE11
2. Edit a page in Objects mode
3. Add an object (e.g. Date)
4. Click 'Save & View'
5. Edit the page again in Objects mode
6. Click the red X - 'Remove this object' to delete it
7. Click Yes, then click 'Save & View'

EXPECTED RESULTS

The page is displayed in view mode.

ACTUAL RESULTS

When clicking 'Save & View' after adding/removing an object (Steps 4 and 7), a Page leaving confirmation box is displayed.

At this point, if clicking "Leave this page" a Warning is displayed (see attached screenshot), but if clicking "Stay on this page" no warning occurs and the page is displayed in view mode.

Reproduced also on XWiki 12.10.4 and 13.1 SNAPSHOT.