It's possible to overwrite the security rules of a page with a final page having the same reference

Steps to reproduce:

1. Login with Admin
2. Create a new nested page under Sandbox (P1)
3. Go to P1 and allow View rights for page and children only for XWikiAdminGroup
4. Create a new simple user (U1)
5. Login as U1
6. Create a new terminal page under Sandbox using the same name as P1 (P2)
7. Go to Page Index and filter for P1
8. Click on Delete for P1, the nested page for which you don't even have View rights
9. Expand "Affects children" -> you see an empty livetable. Most probably it should list the page WebPreferences, for which you don't have View rights
10. Click "Yes, please delete this page" -> You get an error saying: "You are not allowed to view this page or perform this action."
11. Go to Page Index and filter for P1 -> P1 is not displayed in the livetable, since it was deleted by U1

This issue is not the same as XWIKI-13341, since for my usecase U1 is not the creator of P1.