Page lock warning when resolving a version conflict by selecting "Reload the editor (discard changes)"

Steps to reproduce

1. Login as Admin
2. Go to a page
3. Open the same page in a different browser (or an incognito window) and login with the user (U1) there
4. With Admin, edit the page in-place (insert e.g. 'edit1')
5. Click 'Save'
6. With U1, on the incognito window (force edit the page if the case), add some text e.g. 'edit2' on the same line
7. Click 'Save'
8. Go back to the browser where Admin is logged in and type a word (e.g. 'edit3') in the same line
9. Click 'Save'
10. On the Version Conflict box, select 'Reload the editor (Discard changes)'
11. Click 'Save'

Expected results

The page lock is not displayed and the content is saved with the last modification saved by the user (e.g. 'edit2').

Actual results

A page lock is displayed that the page is currently locked by U1. However, the content is saved as expected.

The lock could be reproduced also on XWiki 14.10.6 and 14.10.7, but could not be reproduced on XWiki 14.10.5.